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# EMS-ESP
This repo contains a custom PCB ( requires EasyEDA for reading ) for the [EMS-ESP](https://docs.emsesp.org/) project. As controller a ESP32-C3 is used. As the device is mounted in my case inside the control box of the heater, the version with an external anternna was chosen. If the WiFi connection is unstable, it would be possible, to add a external antenna. The repo contains also the CAD files for the case. For assembling the case 4 M3x10 screws are required. They can be srewed in from the back to hold the PCB in place and the case together. If you want to add additional hardware, there are 4 1A outputs, which can freely be used to connect external components. Then, there are the Pin headers CN1 and CN2, both are directly connected to the ESP. Additionally they have a 3.3V and a GND pin. Flashing the ESP can be done directly through the USB bus. For instructions use the [official documentation](https://docs.emsesp.org/Building/). There is a solder bridge called SJ2 next to the left big capacitors. You have to solder the bridge between the middle and the upper or the lower pad, for the power source you want to use. This is done, to protect your computerr, if you connect both at the same time. As the PCB contains a builtin voltage regulator, you can most of the time connect the ESP directly to a DC Out from the heater. The voltage has to be in the range from 4.5V to 40V. Connected with an external 12V power supply and a established WiFi connection, the PCB consumed about 0.5W.