Ai Thinker Technology ESP01E WiFi module User Manual

Shenzhen Ai-Thinker Technology co., LTD WiFi module

User Manual

ESP-01/07/12 Series Modules User's Manual OEM/Integrators Installation Manual Version 1.4 Ai-Thinker Inc Copyright (c) 2017
ESP-01/07/12 Series Modules User's Manual V1.4 Revision Record Date Version Author Release Notes 2017.07.01 V1.0 Wang Chong First Version 2017.09.04 V1.1 Wang Chong Add ESP-01M, Delete ESP-12E 2017.12.18 V1.2 Fang Dongbin Modify the GPIO4 pin description, change the contact number 2018.3.10 V1.3 Lv Junxiong Add ESP-01F 2018.8.16 V1.4 Lv Junxiong Add ESP-01E
ESP-01/07/12 Series Modules User's Manual V1.4 FCC STATEMENT Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: – Reorient or relocate the receiving antenna. – Increase the separation between the equipment and receiver. – Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. – Consult the dealer or an experienced radio/TV technician for help. Please notice that if the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: “Contains FCC ID:2AHMR-ESP01M” or “Contains FCC ID:2AHMR-ESP07S”or “Contains FCC ID:2AHMR-ESP12S” or “Contains FCC ID:2AHMR-ESP12F” or “Contains FCC ID:2AHMR-ESP01E”or “Contains FCC ID:2AHMR-ESP01F”any similar wording that expresses the same meaning may be used. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator & your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. The module is limited to OEM installation ONLY. The OEM integrator is responsible for ensuring that the end-user has no manual instruction to remove or install module. The module is limited to installation in mobile application. A separate approval is required for all other operating configurations, including portable configurations with respect to Part 2.1093 and difference antenna configurations. There is requirement that the grantee provide guidance to the host manufacturer for compliance with Part 15B requirements.
ESP-01/07/12 Series Modules User's Manual V1.4 Table Of Contents 1 Product Overview .............................................................................................. 1!1.1 Product Features ..................................................................................... 1!1.2 Application Plan ..................................................................................... 1!2 Module Interface ................................................................................................ 2!2.1 Package Size ........................................................................................... 2!2.1 Pin Definition ......................................................................................... 6!2.2 Boot Mode .............................................................................................. 7!3 Electrical Characteristics ................................................................................... 8!3.1 Maximum Ratings .................................................................................. 8!3.2 Suggested Working Environment ........................................................... 8!3.3 Digital Port Features ............................................................................... 8!3.4 Power Consumption ............................................................................... 8!3.5 Transmit Power ..................................................................................... 10!3.6 Receive Sensitivity ............................................................................... 10!4 Hardware Guidance ......................................................................................... 11!4.1 Typical Applications ............................................................................. 11!4.2 PCB Antenna Display Instructions ....................................................... 13!4.3 Module Peripheral Routing Instructions ............................................... 14!4.4 GPIO Level Conversion ....................................................................... 15!4.5 Power Supply Reference Design .......................................................... 15!4.6 ADC Supply Reference Design ............................................................ 15!4.7 Automatically Download Reference Design ........................................ 16!4.8 Reflow oven temperature curve ............................................................ 16!5 Usage Guide .................................................................................................... 17!5.1 Introduction To The Basic AT Command ............................................ 17!5.1.1 AT .............................................................................................. 17!5.1.2 AT+GMR .................................................................................. 17!5.1.3 AT+RST .................................................................................... 17!
ESP-01/07/12 Series Modules User's Manual V1.4 5.1.4 AT+RESTORE .......................................................................... 18!5.2 Use Examples ....................................................................................... 18!5.2.1 TCP Communication Test ......................................................... 18!5.2.2 UDP Communication Test ......................................................... 20!6 FAQ ................................................................................................................. 22!6.1 Garbage Instructions When Power Is On ............................................. 22!6.2 How To Shield The Power When The Garbled .................................... 22!6.3 Can’t Burn Normally ......................................................................... 22!6.4 SDK Development Environment .......................................................... 23!6.5 Startup Information Description ........................................................... 23!7 Module Selection ............................................................................................. 23!8 Contact US ....................................................................................................... 25!
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 1 of 23 1 Product Overview ESP8266 series wireless module is a series of cost-effective Wi-Fi SOC module which can be developed independently. The series modules support the standard IEEE802.11 b/g/n protocol, built-in complete TCP/IP protocol stack. Users can use this series of modules to add networking capabilities to existing devices, or to build standalone network controllers. Ai-Thinker Technology can provide customers with a complete hardware, software reference program, in order to shorten your product development cycle, for your cost savings. 1.1 Product Features ! The smallest 802.11b/g/n Wi-Fi SOC module ! Using low-power 32-bit CPU, can also serve as the application processor ! Clocked at up to 160MHz ! Built-in 10 bit high precision ADC ! Support UART/GPIO/IIC/PWM/ADC/HSPI and other interfaces ! Integrated Wi-Fi MAC/BB/RF/PA/LNA ! Supports multiple sleep modes, deep sleep current as low as 20uA ! Embedded Lwip protocol stack ! Support STA/AP/STA + AP work mode ! Supports Smart Config/AirKiss key distribution network ! Serial port rate up to 4Mbps ! General AT commands can be used quickly ! Support SDK secondary development ! Supports serial local upgrade and remote firmware upgrade (FOTA) 1.2 Application Plan !Industrial wireless control !Infant Monitor !IP camera !Sensor network !Household appliances !Home automation !Smart socket/intelligent light !Mesh network !Wearable electronic products !Wireless location sensing device !Security ID tag !Wireless positioning system beacon
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 2 of 23 2 Module Interface 2.1 Package Size Figure 2.1 ESP-01/ESP-01S pin dimensions Figure 2.2 ESP-01M pin dimensions
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 3 of 23 Figure 2.3 ESP-01F pin dimensions Figure 2.4 ESP-07 pin dimensions
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 4 of 23 Figure 2.5 ESP-07S pin dimensions Figure 2.6 ESP-12F pin dimensions
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 5 of 23 Figure 2.7 ESP-12S pin dimensions Figure 2.7 ESP-01E pin dimensions
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 6 of 23 Table 2.1 ESP series module size table Model Length (mm) Width (mm) Height (mm PAD size (mm) Pin Spacing (mm) Shielded Shell (mm) Thickness (mm) ESP-01 ESP-01S 24.7 14.4 11.0 1.5 x 1.5 2.54 - 1.0±0.1 ESP-01M 18 18 2.8±0.2 - 1.6 2.0 0.8±0.1 ESP-01F 11 10 2.0±0.2 1.1 1.2 0.8±0.1 ESP-07 21.2 16.0 3.0±0.2 - 2.0 2.0 0.8±0.1 ESP-07S 17.0 16.0 3.0±0.3 1 x 1.2 2.0 2.0 0.8±0.1 ESP-12F 24.0 16.0 3.0±0.2 2.0 2.0 0.8±0.1 ESP-12S 24.0 16.0 3.0±0.2 1 x 1.2 2.0 2.0 0.8±0.1 2.1 Pin Definition Table 2.2 ESP Series Module Pin Function Definitions Pin Number Pin Name Remarks 01 01S 01M 01E 01F 07 07S 12S 12F 7 18 18 16 1 1 RST Reset Pin, Active Low - 16 16 3 2 2 ADC AD conversiont, Input voltage range 0~1V, the value range is 0~1024. 6 9 9 4 3 3 EN Chip Enabled Pin, Active High - 17 17 5 4 4 IO16 Connect with RST pin to wake up Deep Sleep - 15 15 6 5 5 IO14 HSPI_CLK，IR_T，I2C_SCL，I2SI_WS - 14 14 7 6 6 IO12 HSPI_MISO - 5 5 8 7 7 IO13 HSPI_MOSI; UART0_CTS 8 2 2 17 8 8 VCC Module power supply pin, the voltage range of 3.0 ~ 3.6V - - - - - 9 CS0 Flash chip select signal - - - - - 10 MISO Slave Output Master Input - 11 11 - - 11 IO9 Gpio9，Only ESP-01M/01E Can
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 7 of 23 - 12 12 - - 12 IO10 Gpio10,Only ESP-01M/01E Can - - - - - 13 MOSI Master Output Slave Input - - - - - 14 SCLK Clock 1 1 1 2/18 9 15 GND GND - 6 6 9 10 16 IO15 HSPI_CS，U0_RTS，I2SO_BCK 2 7 7 10 11 17 IO2 U1_TXD，I2C_SDA，I2SO_WS 3 8 8 11 12 18 IO0 GPIO0，HSPI_MISO，I2SI_DATA - 10 10 12 13 19 IO4 GPIO4 - 13 13 13 14 20 IO5 IR_R 4 4 4 14 15 21 RXD GPIO3，I2SO_DATA 5 3 3 15 16 22 TXD GPIO1 - - 1 1 - - ANT，Only ESP-01F/01E Can Note: Only GPIO4 and GPIO5 are low at boot time, the other GPIO are high. 2.2 Boot Mode Table 2.3 Description of the ESP series module boot mode Mode CH_PD (EN) RST GPIO15 GPIO0 GPIO2 TXD0 Download mode high high low low high high Running mode high high low high high high Chip Test mode high high - - - low
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 8 of 23 3 Electrical Characteristics 3.1 Maximum Ratings Table 3.1 Maximum Ratings Rated value condition Value Unit Storage Temperature - -40 ~ 90 ℃ Maximum Welding Temperature - 250 ℃ Supply Voltage IPC/JEDEC J-STD-020 +3.0 ~ +3.6 V 3.2 Suggested Working Environment Table 3.2 Recommended working environment Work Environment Name Min Typ Max Unit Operating Temperature -20 20 85 ℃ Supply Voltage VDD 3.0 3.3 3.6 V 3.3 Digital Port Features Table 3.3 Digital Port Features Port Name Min Typ Max Unit Input logic level low VIL -0.3 - 0.25 * VDD V Input logic level high VIH 0.75 * VDD - VDD + 0.3 V Output logic level low VOL N - 0.1 * VDD V Output logic level high VOH 0.8 * VDD - N V Note: Unless otherwise specified, the test conditions are: VDD = 3.3 V and temperature 20 ℃. 3.4 Power Consumption All measurements are made at the antenna interface without SAW filters.
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 9 of 23 All transmit data is based on a 90% duty cycle measured in the continuous firing mode. Table 3.4 Power consumption Mode Min Typ Max Unit Transmit 802.11b, CCK 11Mbps, POUT = + 17dBm 170 mA Transmit 802.11g, OFDM 54Mbps, POUT = + 15dBm 140 mA Transmit 802.11n, MCS7, POUT = + 13dBm 120 mA Receive 802.11b, packet length 1024 bytes, -80dBm 50 mA Receive 802.11g, packet length 1024 bytes, -70dBm 56 mA Receive 802.11n, packet length 1024 bytes, -65dBm 56 mA Modem-Sleep① 20 mA Light-Sleep② 2 mA Deep-Sleep③ 20 uA Power Off 1 uA Note: Modem-Sleep is used to require the CPU to remain in operation, such as PWM or I2S. When there is no data transmission while maintaining a WiFi connection, power off the WiFi Modem circuit according to the 802.11 standard (eg U-APSD). For example, in DTIM3, every sleep 300mS, wake up 3mS receive AP Beacon package, etc., the overall average current of about 20mA. Note ②: Light-Sleep for CPU can be suspended applications, such as WiFi switch. If there is no data transmission while maintaining a WiFi connection, the WiFi Modem circuit can be switched off and the CPU is powered down according to the 802.11 standard (eg U-APSD). For example, at DTIM3, every sleep 300 ms, wake up 3 ms to receive AP's Beacon packets, etc., the overall average current is about 2 mA. Note: Deep-Sleep is used for applications that do not have to keep the WiFi connection for a long time, such as a sensor that measures the temperature once every 100 seconds. Every 300 s wake up after 0.3s - 1s connected to the AP to send data, the overall average current can be much smaller than 2mA.
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 10 of 23 3.5 Transmit Power Table 3.5 RF parameters Describe Min Typ Max Unit 802.11b@11Mbps 14 16 18 dBm 802.11g@54Mbps 12 14 16 dBm 802.11n@HT20, MCS7 11 13 15 dBm 3.6 Receive Sensitivity Table 3.6 Receiving Sensitivity Parameter Min Typ Max Unit DSSS, 1 Mbps -95 dBm CCK, 11 Mbps -80 dBm 6 Mbps (1/2 BPSK) -88 dBm 54 Mbps (3/4 64-QAM) -70 dBm HT20, MCS7 (65 Mbps, 72.2 Mbps) -67 dBm
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 11 of 23 4 Hardware Guidance 4.1 Typical Applications Note: You can’t use USB to TTL 3.3V or 5V power supply, it is recommended to use two dry batteries or after conversion through the LDO 3.3V, it is strongly recommended to buy a new development board. Figure 4.1 Typical application of ESP-01 Figure 4.2 Typical application of ESP-01S Figure 4.3 Typical application of ESP-01M
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 12 of 23 Figure 4.4 Typical application of ESP-01F Figure 4.5 Typical application of ESP-07 Figure 4.6 Typical application of ESP-07S
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 13 of 23 Figure 4.7 Typical application of ESP-12E/ESP-12F Figure 4.8 Typical application of ESP-12S Figure 4.9 Typical application of ESP-01E 4.2 PCB Antenna Display Instructions The ESP8266 series module can be soldered to the PCB board. In order to get the best RF performance of the end product, please pay attention to the rational
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 14 of 23 design of the module and the placement of the antenna on the bottom plate according to this guide. Option 1 (recommended): Place the module along the edge of the PCB board, and the antenna is placed outside the frame or along the board and the bottom is hollowed out; Option 2: The module placed along the PCB board side, the antenna placed along the board and the bottom of the hollow; Option 3: Place the module along the board side of the board, the antenna placed along the board and the bottom are not copper. Figure 4.7 ESP-12S antenna placement instructions 4.3 Module Peripheral Routing Instructions The ESP8266 series modules integrates high-speed GPIO and peripheral interfaces, which can cause severe switching noise. If some applications require high power and EMI characteristics, it is recommended to connect 10 to 100 ohms in series on digital I/O lines. This can suppress overshoot when switching power supplies and make the signal smooth. Series resistance can also prevent electrostatic discharge (ESD) to some extent.
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 15 of 23 4.4 GPIO Level Conversion Figure 4.8 Transistor level conversion 4.5 Power Supply Reference Design Figure 4.9 Power supply reference 4.6 ADC Supply Reference Design Figure 4.10 ADC supply reference
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 16 of 23 4.7 Automatically Download Reference Design Figure 4.11 Automatically Download Reference Design 4.8 Reflow oven temperature curve Figure 4.12 Reflow furnace temperature curve
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 17 of 23 5 Usage Guide ESP8266 series module factory default built-in AT firmware, and the default baud rate of 115200, can refer to 4.1 typical application diagram to build the minimum system circuit, then the AT command operation. Serial and network debugging tools download: http://wiki.ai-thinker.com/tools 5.1 Introduction To The Basic AT Command This chapter only describes the common AT commands, please refer to http://wiki.aithinker.com/esp8266/docs#at。 5.1.1 AT parameters No Description Test AT is OK Example AT OK 5.1.2 AT+GMR parameters No Description Returns the firmware version information Example AT+GMR AT version:1.2.0.0(Jul 1 2016 20:04:45) SDK version:1.5.4.1(39cb9a32) Ai-Thinker Technology Co. Ltd. Dec 2 2016 14:21:16 OK 5.1.3 AT+RST parameters No Description soft restart module Example AT+RST OK
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 18 of 23 5.1.4 AT+RESTORE parameters No Description Reset the module to factory settings Example AT+RESTORE OK 5.2 Use Examples This section explains how to configure two modules through the serial port on the PC side to communicate with each other over TCP/UDP. For more examples, please refer to: http://wiki.ai-thinker.com/esp8266/examples/at_demo. Test, through the PC side instead of one end of the module to establish the appropriate connection. 5.2.1 TCP Communication Test TCP Server is in AP mode and TCP Client is Station mode. TCP Server Configuration： Ai-Thinker Technology Co. Ltd. ready AT+CWMODE=2 //configured for AP mode OK AT+CWSAP_DEF="TCP_Server","12345678",5,4 //Configure AP information OK AT+CIFSR //Query the local IP address +CIFSR:APIP,"192.168.4.1" +CIFSR:APMAC,"a2:20:a6:19:c7:0a" OK AT+CIPMUX=1 //open multiple links
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 19 of 23 OK AT+CIPSERVER=1 //open the server OK 0,CONNECT //There is a client connected to the server +IPD,0,10:Ai-Thinker //received 10 data (Ai-Thinker) AT+CIPSERVER=0 //Close the server OK 0,CLOSED //TCP connection is off TCP Client Configuration： Ai-Thinker Technology Co. Ltd. ready AT+CWMODE=1 //configured for station mode OK AT+CWJAP_DEF="TCP_Server","12345678" //Connect to AP WIFI CONNECTED WIFI GOT IP OK AT+CIFSR //Query the local IP address +CIFSR:STAIP,"192.168.4.2" +CIFSR:STAMAC,"5c:cf:7f:91:8b:3b" OK AT+CIPMUX=0 //open single link OK AT+CIPSTART="TCP","192.168.4.1",333 //Connect to TCP server CONNECT OK AT+CIPSEND=10 //send 10 bytes of data to the server side
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 20 of 23 OK > //After the emergence of the symbol serial port to send Ai-Thinker (without carriage return line) Recv 10 bytes //The serial port receives the data SEND OK //sent successfully CLOSED //TCP connection is closed 5.2.2 UDP Communication Test One is in AP mode , the local port is 8001, and the other is Station mode. the local port is 8002. AP Configuration： Ai-Thinker Technology Co. Ltd. ready AT+CWMODE=2 //configured for AP mode OK AT+CWSAP_DEF="TCP_Server","12345678",5,4 //AP information OK AT+CIFSR //Query the local IP address +CIFSR:APIP,"192.168.4.1" +CIFSR:APMAC,"a2:20:a6:19:c7:0a" OK AT+CIPSTART="UDP","192.168.4.2",8002,8001,0 //Open UDP connection CONNECT OK +IPD,10:Ai-Thinker //received 10 data (Ai-Thinker) AT+CIPSEND=10 //send 10 bytes of data to the server OK
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 21 of 23 > //After the emergence of the symbol serial port to send Ai-Thinker (without carriage return line) Recv 10 bytes //The serial port receives the data SEND OK AT+CIPCLOSE //close the UDP connection CLOSED OK Station Configuration： Ai-Thinker Technology Co. Ltd. ready AT+CWMODE=2 //configured for station mode OK AT+CWSAP_DEF="TCP_Server","12345678",5,4 //Connect to AP OK AT+CIFSR //Query the local IP address +CIFSR:STAIP,"192.168.4.2" +CIFSR:STAMAC,"5c:cf:7f:91:8b:3b" OK AT+CIPSTART="UDP","192.168.4.1",8001,8002,0 //Open UDP connection CONNECT OK AT+CIPSEND=10 //send 10 bytes of data to the server OK > //After the emergence of the symbol serial port to send Ai-Thinker (without carriage return line) Recv 10 bytes //The serial port receives the data SEND OK
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 22 of 23 +IPD,10:Ai-Thinker //received 10 data (Ai-Thinker) AT+CIPCLOSE //close the UDP connection CLOSED OK 6 FAQ 6.1 Garbage Instructions When Power Is On ESP8266 chip itself supports 26MHz and 40MHz crystal, if the use of 40MHz crystal, the default baud rate of 115200, if the use of 26MHz crystal, the UART0 power after the baud rate = 26 * 115200/40 = 74880, the letter can be ESP8266 Series modules are used 26MHz, because the general serial port tool does not support the baud rate, so there will be printed on the garbled. You can use the security serial interface assistant to configure the baud rate 74880 to view the startup information. Note: part of the USB to TTL does not support 74880 baud rate, the computer comes with RS232 to TTL does not support 74880 baud rate, recommend the use of FT232, CP2102, CH340 and other chips. 6.2 How To Shield The Power When The Garbled U0TXD default power will be system printing, through the UART's internal pin switching function, user_init () call system_uart_swap () function, the new U0TXD change to GPIO15, U0RXD change to GPIO13, the hardware connection on the two cited Feet can be serial communication. Note: After the exchange, the download pin on the hardware is still the original U0TXD and U0RXD. 6.3 Can’t Burn Normally Refer to http://wiki.ai-thinker.com/esp_download to download, pay attention to download before the module to ensure that the download mode.
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 23 of 23 6.4 SDK Development Environment Refer to http://wiki.ai-thinker.com/ai_ide_install to build the SDK development environment. 6.5 Startup Information Description Start, if the power and serial port connection is normal, then the baud rate 74880 to see the first sentence is as follows: ets Jan 8 2013,rst cause:1, boot mode:(3,6) The start and start modes of the module can be analyzed based on the print information: rst cause ： 1: Power restart 2: External reset 4: Hardware watchdog reset boot mode： The second in parentheses has no practical meaning, the first can refer to the following table to start the information analysis: Table 6.1 Startup Mode Description Value Mode GPIO0 GPIO2 GPIO15 0 - 0 0 0 1 Download Mode 0 1 0 2 - 1 0 0 3 Run mode 1 1 0 4 - 0 0 1 5 - 0 1 1 6 - 1 0 1 7 - 1 1 1 7 Module Selection model ESP-01 ESP-01S ESP-01M ESP-07 ESP-07S ESP-12F ESP-12S Package DIP-8 DIP-8 SMD-18 SMD-16 SMD-16 SMD-22 SMD-16
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 24 of 23 Size(mm) 24.7*14.4 24.7*14.4 18*18 21.2*16.0 17.0*16.0 24.0*16.0 24.0*16.0 layer 2 2 4 2 4 4 4 Flash size 8Mbit 8Mbit 8Mbit 8Mbit 32Mbit 32Mbit 32Mbit Certification - - - - FCC/CE FCC/CE FCC/CE Antenna PCB PCB PCB Ceramic IPEX IPEX PCB PCB Indicator light TXD0 POWER GPIO2 GPIO2 POWER - GPIO2 GPIO2 GPIO2 Available IO 2 2 11 9 9 9 9 For more selection information please see http://wiki.ai-thinker.com/esp8266 or contact us.
ESP-01/07/12 Series Modules User's Manual V1.4 Copyright © 2017 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved Page 25 of 23 8 Contact US Official website: https://www.ai-thinker.com Develop Wiki: http://wiki.ai-thinker.com Official forum: http://bbs.ai-thinker.com Sample purchase: https://anxinke.taobao.com Business cooperation: sales@aithinker.com Technical support: support@aithinker.com Telephone: 0755-29162996 Company Address: 6/F, Block C2, Huafeng Industrial Park, Hangcheng Road, Bao'an Road, Baoan District, Shenzhen ,China WeChat AiSmart APP

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