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25 lines
1.4 KiB
Markdown
25 lines
1.4 KiB
Markdown
Here is a prototype board you can build yourself on a breadboard for testing.
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The breadboard layout was done using [DIY Layout Creator](https://github.com/bancika/diy-layout-creator) and sources files are included in this repo.
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The schematic used:
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*Optionally I've also added 2 0.5A/72V polyfuses between the EMS and the two inductors L1 and L2 for extra protection.*
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**Powering The EMS Circuit**
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The EMS circuit will work with both 3.3V and 5V. It's easiest though to power directly from the ESP8266's 3V3 line and run a steady 5V into the microcontroller. Powering the ESP8266 microcontroller can be either:
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- via the USB if your dev board has one
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- using an external 5V power supply into the 5V vin on the board
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- powering from the 3.5mm service jack (stereo jack) on the boiler. This will give you 8V so you need a buck converter (like a [Pololu D24C22F5](https://www.pololu.com/product/2858)) to step this down to 5V to provide enough power to the ESP8266 (250mA at least)
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- powering direct from the EMS line, which is 15V DC and using a buck converter as described above.
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| With Power Circuit |
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