mirror of
https://github.com/UtilitechAS/amsreader-firmware.git
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20 lines
865 B
Markdown
20 lines
865 B
Markdown
# Electrical Design
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## Explained
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The design is using an opamp as a compined level converter and a schmitt trigger, in order to convert
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the HAN signal into a 3.3V compatible serial format. As the input levels on the opamp is much higher
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than our 5V supply, we are rectifying and smoothing the HAN signal to use for a supply here. (VDD)
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As a power source, we've used a micro USB connector, providing 5V, just as this is cheap and easy. However,
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no part of the circuit will need any other power than the 3.3V, so any combination of power source and
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regulator that provides the 3.3V will do.
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The ESP8266 setup is a rather standaraized setup and will allow for programming the ESP directly on the
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board, if needed. During programming, it might be neccessary to disconnect the incoming HAN.
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## Schematics
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## PCB
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