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Th3maz1ng 2021-07-30 23:55:22 +02:00
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@ -41,11 +41,13 @@ Indeed, this relay board was meant to be controled by sending very poorly design
To be honest, the best way to flash our own firmware on this board is to replace the ATMEGA328PU with one which has the Arduino bootloader burnt on it :-(.<br />
Indeed after looking at the reverse engineered schematic, the SPI pins needed for an ISP are not exposed (they are not even used...).<br />
Fortunately enough, the onboard FTDI seems to be connected with the DTR line which is connected through a capacitor to the ATMEGA's reset pin that is required by the Arduino bootloader.<br />
I will test it this weekend and keep you informed.
The test is done and IT WORKS !!!. I took an Arduino pro mini 3.3V 8MHz. I desoldered the ATMEGA328PU that was on it and soldered it back on the relay board.<br />
I then connected the board to the PC with a USB cable and started the Arduino IDE.<br />
In the tools menu of the IDE I chose the Arduino UNO board and I flashed the blink sketch.<br />
The download process worked and the led L (which is pin 13 luckily) started blinking as expected.<br />
I will test it this weekend and keep you informed.<br />
**The test is done and IT WORKS !!!**.
1. I took an Arduino pro mini 3.3V 8MHz. I desoldered the ATMEGA328PU that was on it and soldered it on the relay board.
2. I then connected the relay board to the PC with an USB cable and started the Arduino IDE.
3. In the tools menu of the IDE I chose the Arduino UNO board and I flashed the blink sketch.
4. The download process worked and the led L (which is pin 13 luckily) started blinking as expected.
5. We can now write our own firmware.
## Could the onboard ATMEGA be saved ?
I will try to restore the chip to it's factory state by programming it with a HVPP (High Voltage Parallel Programmer) in order to reset the fuse bytes as well if they are set of course ...<br />