Hi I've got a CP2102 USB to UART Bridge and a Pro MINI. They both have DTR pin. The CP2102 USB to UART Bridge http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=400565980256&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 The Pro Mini I'm using. http://webdca.com/abd/images/dr-pro-mini-knockoff-backside.jpg
But it won't upload sketches if I don't press the reset button. I've no idea if DTR works on the CP2102 USB to UART Bridge.
But for sure I can't get it working on the Pro Mini. If I'm right, it should reboot when I pull down DTR to ground as it does when I do pull down RESET to ground. But it doesn't. I thought of a bad 0.1uF capacitor between RESET and DTR, but shorting RESET to ground trough an external 0.1uF capacitor doesn't reboot either.
I've read a lot of things about DTR, but it seems it's been hacked from the serial port to be used to reset the Arduino. So my question is : Does it have just to be grounded or does it have to be applied a specific signal to make DTR working ? How can I troubleshoot the problem ?
I found this that might and seems to be interesting but my english and electronic skills are to weak to understand. http://electronics.stackexchange.com/questions/61537/what-is-the-cap-for-in-arduino-reset-circuit
Thanks for your help.