OTGW power problem

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Stoffel67
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Joined: Monday 18 April 2016 19:28
Target OS: Windows
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OTGW power problem

Post by Stoffel67 » Thursday 21 April 2016 7:51

Hello

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:
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)
IC2 USB-TTL
PIN 11 TX
PIN 12 RX
PIN 15 GND
PIN 16 5V

Connection with Hyperterminal, I get the following output
OpenTherm Gateway 4.2
R80000100
R80000100
R80000100
R80000100
R80000100
R80000100
....
So the PIC16F88 seems OK,

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...

kind regards
Stefan

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