I have a CHR340G USB to TTl adapter and a Pro Mini Arduino.
Can anybody tell me how to connect the adapter to the Pro Mini?
The Pro Mini has these pins (DTR, TX0, RXI, VCC, GND, GND)
and the adapter has (5V, VCC, 3V3, TXD, RXD, GND).
I am using the 5V, TXD,RXD,and GND from the adapter.
What is the DTR on the Pro Mini? Why are there two GND on the adapter?
How do connect these two components together? I know that the TRXD and RXD should go to the RXI and the TX0 respectively.
I’m no expert on the pro mini - but the DTR line usually connects via a capicitor and pull-up resistor to the processor result , to force a reset as the data transfer starts .
There are masses of tutorials on the web on this that Mr Google finds.
Thanks for your early reply.
The problem was that the CH340G doesn't have a DTR pin so I connected all what it does have to the corresponding pins on the Pro Mini (making sure to reverse the TX and RX pins). Finally I discovered that, because CH340G doesn't have a DTR pin, I need to press the reset button on the Pro Mini the precise moment my programme started to upload. Now it works.
I found this useful tip here Arduino PRO MINI – How to upload code | alselectro