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updated power section

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proddy
2018-05-27 11:57:38 +02:00
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@@ -17,8 +17,7 @@ There are 3 parts to this project, first the design of the circuit, second the c
- [Debugging](#debugging)
- [Building the Circuit](#building-the-circuit)
- [Powering the circuit](#powering-the-circuit)
- [Known Issues](#known-issues)
- [To Do](#to-do)
- [Known Issues and ToDo's](#known-issues-and-todos)
- [How the EMS works](#how-the-ems-works)
- [IDs](#ids)
- [1. EMS Polling](#1-ems-polling)
@@ -116,28 +115,27 @@ The schematic used (as designed by [susisstrolch](https://github.com/susisstrolc
*Optionally I've also added 2 0.5A/72V polyfuses between the EMS and the two inductors L1 and L2 for extra protection.*
And lastly if you don't fancy building the circuit [bbqkees](http://www.domoticz.com/forum/memberlist.php?mode=viewprofile&u=1736) can sell you one which looks like the photo below running on a Wemos D1 Mini:
And lastly if you don't fancy building the circuit, [bbqkees](http://www.domoticz.com/forum/memberlist.php?mode=viewprofile&u=1736) can sell you one complete with SMD components which looks like the photo below when connected to a Wemos D1 Mini:
![WemosD1](doc/schematics/wemos_kees.png)
## Powering the circuit
The circuit will work with both 3.3V and 5V. It's easiest to power it direct from the ESP's 3V3 line.
My circuit will work with both 3.3V and 5V. It's easiest though to power directly from the ESP's 3V3 line.
Powering the ESP can be either via a USB and PC or external 5V power supply or from the EMS itself using a buck step-down converter. The EMS provides about 15V AC current. It's tidier to run it from the EMS and I use a [Pololu D24C22F5](https://www.pololu.com/product/2858) which is 5V/2A buck step-down module. It is slightly overkill for what we need. The additional part of the circuit is shown below along with a working prototype on a breadboard using a NodeMCU2 with the additional LEDs:
Powering the ESP89266 can be either via the USB from a PC or external 5V power supply or from the EMS line itself using a buck step-down converter. The EMS provides about 15V AC current. The advantage of using the EMS is obviously less power cables and it's neater to place inline with the thermostat. I use a [Pololu D24C22F5](https://www.pololu.com/product/2858) which is 5V/2A buck step-down module and probably slightly overkill for what we need. The additional part of the circuit is shown below along with an earlier breadboard prototype using a NodeMCU2 (with the additional LEDs):
Power circuit | Example |
--- | ---
![Power circuit](doc/schematics/power.PNG) | ![Breadboard](doc/schematics/breadboard_example.png) |
## Known Issues
## Known Issues and ToDo's
* Very infrequently an EMS write command is not sent, probably due to a collision somewhere in the UART between an incoming Rx and a Poll. The retries in the code fix that but it is annoying nevertheless and does need fixing.
Some annoying issues that need fixing:
* Very infrequently an EMS write command is not sent, probably due to a collision somewhere in the UART between an incoming Rx and a Poll. The retries in the code fix for now.
* I've seen a few duplicate telegrams being processed. Again, it's harmless and not a big issue. But its still a bug.
## To Do
Here's my top things I'm still working on:
* Make an ESPurna version. ESPurna is a lovely framework that takes care of the WiFi, MQTT, web server, telnet & debugging.