I am new to OTGW, I got a new heating (ELCO Trigon S with QAA73)
and I want to monitor the heating.
I bought a OTGW Board and assembled it.
I did all the checks from this side. http://otgw.tclcode.com/debugging.html
All checks are OK, all current are within the mentioned range.
until I put in den PIC16F88!
before the voltage on IC1 between pin5 and pin14 is 5,05V
after mounting the PIC, the voltage drops to 1.25V
I conneted a USB-TTL adapter this way: (without 230V power connected)
PIN 11 TX
PIN 12 RX
PIN 15 GND
PIN 16 5V
Connection with Hyperterminal, I get the following output
So the PIC16F88 seems OK,OpenTherm Gateway 4.2
there must be something wrong with the power supply between IC3 and IC1
What went wrong? where do I start searching?
Please, could someone point me to the right direction...