mirror of
https://github.com/UtilitechAS/amsreader-firmware.git
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42 lines
2.9 KiB
Markdown
42 lines
2.9 KiB
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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## Componenet list
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Name | Value | Part
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-----|------|-----
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C1|10uF/25V|[P5148-ND](https://www.digikey.no/product-detail/en/panasonic-electronic-components/ECA-1EM100/P5148-ND/245007)
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C2|100nF|[BC1101CT-ND](https://www.digikey.no/product-detail/en/vishay-bc-components/K104K10X7RF5UH5/BC2665CT-ND/2356879)
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C3|220uF/35V|[1572-1706-ND](https://www.digikey.no/product-detail/en/illinois-capacitor/227CKS035M/1572-1706-ND/5411729)
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D1|1N4148|[1N4148FS-ND](https://www.digikey.no/product-detail/en/fairchild-on-semiconductor/1N4148/1N4148FS-ND/458603)
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P1||[609-4613-1-ND](https://www.digikey.no/product-detail/en/amphenol-fci/10118192-0001LF/609-4613-1-ND/2785378)
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P2|Female|[S7004-ND](https://www.digikey.no/product-detail/en/sullins-connector-solutions/PPTC061LFBN-RC/S7004-ND/810145)
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P3|Male|[952-2262-ND](https://www.digikey.no/product-detail/en/harwin-inc/M20-9990246/952-2262-ND/3728226)
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P4||[609-1047-ND](https://www.digikey.no/product-detail/en/amphenol-fci/54602-910LF/609-1047-ND/1001361)
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Q1|BC337|[BC33725TACT-ND](https://www.digikey.no/product-detail/en/fairchild-on-semiconductor/BC33725TA/BC33725TACT-ND/1532787)
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R1-5,10,11|10K|[CF14JT10K0CT-ND](https://www.digikey.no/product-detail/en/stackpole-electronics-inc/CF14JT10K0/CF14JT10K0CT-ND/1830374)
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R8|100K|[CF14JT100KCT-ND](https://www.digikey.no/product-detail/en/stackpole-electronics-inc/CF14JT100K/CF14JT100KCT-ND/1830399)
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R9|330R|[CF14JT330RCT-ND](https://www.digikey.no/product-detail/en/stackpole-electronics-inc/CF14JT330R/CF14JT330RCT-ND/1830338)
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R12,13|47K|[CF14JT47K0CT-ND](https://www.digikey.no/product-detail/en/stackpole-electronics-inc/CF14JT47K0/CF14JT47K0CT-ND/1830391)
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S1,2||[450-1650-ND](https://www.digikey.no/product-detail/en/te-connectivity-alcoswitch-switches/1825910-6/450-1650-ND/1632536)
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U2|LM1117-3.3|[LM1117IMPX-3.3/NOPBCT-ND](https://www.digikey.no/product-detail/en/texas-instruments/LM1117IMPX-3.3-NOPB/LM1117IMPX-3.3-NOPBCT-ND/3440160)
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U3|LM358|[LM358NGOS-ND](https://www.digikey.no/product-detail/en/on-semiconductor/LM358NG/LM358NGOS-ND/918519)
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Note: The ESP8266 is not included here. It can easily be found on ebay etc
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