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I don't think it would be cost effective for you but Nodo Shop now sell a PIC programmer which can program 16F88 and 16F1847 (also 16LF1847 with add on LV board) https://www.nodo-shop.nl/en/electronic-kits/226-open-programmer-v20s-kit.html A better option is to buy a PIC ready programmed https://www...

OpenTherm Gateway boards do occasionally turn up on eBay UK

I would also recommend using a high quality short USB cable. It's a good idea to check the voltage between F1 and the USB connector shield, needs to be at least 4.75V.

Interesting that the PIC was corrupted to the extent that it couldn't be programmed even with a programmer.

Tim

You could also use a low cost K150 programmer, but note that on Windows 10 it requires an old driver as the latest Prolific driver blocks use of the port.

Tim

I have one of the Nodo Shop boards and can recommend it.

Tim

The 7805 needs to be replaced because it's a linear regulator which is inefficient converting 24V to 5V. This works for the PIC only gateway as the PIC draws very little current, however if higher current is required from 5V it makes sense to use a switching regulator such as R-78E5.0-0.5. It's also...

Can I just say that as a new user I really appreciate all the hard work that has gone into this and the excellent support. It is unfortunate that when things go well users tend to be quiet until problems occur which may be very minor.

Thank you

Tim

Schelte has done an awesome job making the upgrade process bullet proof and helping out idiots like me on this board.

Thank you!

Tim

You're absolutely right, I don't need a PIC programmer.

Thank you again for all your help.

Best wishes

Tim

When the upgrade failed and the gateway wouldn't boot, I remembered my box of spare pre-programmed PICs which seemed the quickest way to get it working. I got the gateway from the boiler and put the original PIC back in. After shorting the reset pins I was able to program it successfully using Rober...

I will still try to update via OTA as it is much more convenient than using a cable or a programmer. I was looking for a programmer to recover the PIC which no longer boots into OTGW. Not urgent! Robert has made some improvements to his firmware which should make upgrading over WiFi more reliable. I...

I did look at that list, however those thermostats were on the market in 2015 and times have changed...

One drawback with the Ideal Halo Lite is there doesn't seem to be any way to control the setpoint from the gateway.

Best wishes

Tim

I saw 5.0 firmware is out for the PIC so I tried upgrading using the NodeMCU + Robert's firmware 0.6.0 and OTMonitor 5.0 Unfortunately the upgrade slowed down at 43% and failed altogether at 50% with lots of errors. I'm not sure why this is. I notified Robert who has now added this to his documentat...

For anyone who is wondering what this is, it's a round OpenTherm wired thermostat with colour display available in the UK for about 30 euros inc. sales tax and shipping.

It's good to see more OpenTherm thermostats becoming available at reasonable prices. Any other recommendations out there?

Tim