wifi-flash-trigger

ESP8266 + Arduino Wifi Flash trigger for high speed photography. Uses esp-link as the wifi link to arduino

Download esp-link

It’s here: https://github.com/jeelabs/esp-link/releases.

Firmware versions:

esp-link: This seems to only work with esp-link v3.0.alpha0 - 2016-10-23, d0377bd. https://github.com/jeelabs/esp-link el-client: https://github.com/jeelabs/el-client (d559214ada405739fa235b13c7e2b42175ddbe95 tested)

Flash the ESP8266

Flash to the esp8266: as per these instructions: https://github.com/jeelabs/esp-link/blob/master/FLASHING.md

esptool.py --port /dev/ttyUSB0 --baud 230400 write_flash -fs 32m -ff 80m 0x00000 boot_v1.6.bin 0x1000 user1.bin 0x3FC000 esp_init_data_default.bin 0x3FE000 blank.bin

Warning

The esp-link in the webserver_controls.ino has debugging enabled

ELClient esp(&Serial, &Serial);

This totally breaks things. Be sure to have debugging disabled if you wish for things to work ELClient esp(&Serial);

Cofigure the esp-link

Connect to 192.168.4.1 and set the settings to this:

RESET	gpio12
ISP/Flash	disabled
Conn LED	disabled
Serial LED	GPIO14
UART Pins	swapped

connect up the arduino:

5 wires: BE SURE TO USE A 3.3V ARDUINO, or use a level shifter

NODEMCU PIN	ESP8266 pin	ARDUINO pin
GND	G		GND
VCC	3V		VCC
RESET	D6	GPIO12	RST
ESPRX	D7	GPIO13	TX
ESPTX	D8	GPIO15	RX

Flash the arduino

Be sure that nothing else (like a web browser) is accessing 192.168.4.1, or avrdude will break.

$ avrdude -p m328p -c stk500v1 -e -U flash:w:.pioenvs/pro8MHzatmega328/firmware.hex -P net:192.168.4.1:23

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: erasing chip
avrdude: reading input file ".pioenvs/pro8MHzatmega328/firmware.hex"
avrdude: input file .pioenvs/pro8MHzatmega328/firmware.hex auto detected as Intel Hex
avrdude: writing flash (1592 bytes):

Writing | ################################################## | 100% 0.48s

avrdude: 1592 bytes of flash written
avrdude: verifying flash memory against .pioenvs/pro8MHzatmega328/firmware.hex:
avrdude: load data flash data from input file .pioenvs/pro8MHzatmega328/firmware.hex:
avrdude: input file .pioenvs/pro8MHzatmega328/firmware.hex auto detected as Intel Hex
avrdude: input file .pioenvs/pro8MHzatmega328/firmware.hex contains 1592 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.93s

avrdude: verifying ...
avrdude: 1592 bytes of flash verified

avrdude: safemode: Fuses OK (E:00, H:00, L:00)

avrdude done.  Thank you.

Sometimes when it fails with 'not in sync'

ioctl("TIOCMGET"): Inappropriate ioctl for device
ioctl("TIOCMGET"): Inappropriate ioctl for device
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x45
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x4c
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x2d
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x43
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x6c
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x69
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x65
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x6e
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x74
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x20

this can help:

../../esp-link-v3.0.14-g963ffbb/avrflash 192.168.4.1 .pioenvs/pro8MHzatmega328/firmware.hex

Troubleshooting

Before flashing the AVR, be sure to set the uC console speed in the web page to 57600
After flashing the AVR, set console speed to 38400 (for 3.3v AVR)
When flashing the AVR, be sure to close all web pages accessing the esp8266
When using a 3.3V AVR, be sure that your serial port speed is set to 38400 or lower.
After flashing the AVR power cycle the ESP8266.
Then you should be able to see the uC RESET connect to the ESP in the console window.

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