Merge branch 'master' of https://github.com/roarfred/AmsToMqttBridge

Electrical/README.md

@@ -0,0 +1,41 @@
+# Electrical Design
+
+## Explained
+The design is using an opamp as a compined level converter and a schmitt trigger, in order to convert 
+the HAN signal into a 3.3V compatible serial format. As the input levels on the opamp is much higher 
+than our 5V supply, we are rectifying and smoothing the HAN signal to use for a supply here. (VDD)
+
+As a power source, we've used a micro USB connector, providing 5V, just as this is cheap and easy. However,
+no part of the circuit will need any other power than the 3.3V, so any combination of power source and 
+regulator that provides the 3.3V will do.
+
+The ESP8266 setup is a rather standaraized setup and will allow for programming the ESP directly on the 
+board, if needed. During programming, it might be neccessary to disconnect the incoming HAN.
+
+## Schematics
+![Schematics](./Schematics.PNG)
+
+## PCB
+![PCB](./PCB.PNG)
+
+## Componenet list
+Name | Value | Part
+-----|------|-----
+C1|10uF/25V|[P5148-ND](https://www.digikey.no/product-detail/en/panasonic-electronic-components/ECA-1EM100/P5148-ND/245007)
+C2|100nF|[BC1101CT-ND](https://www.digikey.no/product-detail/en/vishay-bc-components/K104K10X7RF5UH5/BC2665CT-ND/2356879)
+C3|220uF/35V|[1572-1706-ND](https://www.digikey.no/product-detail/en/illinois-capacitor/227CKS035M/1572-1706-ND/5411729)
+D1|1N4148|[1N4148FS-ND](https://www.digikey.no/product-detail/en/fairchild-on-semiconductor/1N4148/1N4148FS-ND/458603)
+P1||[609-4613-1-ND](https://www.digikey.no/product-detail/en/amphenol-fci/10118192-0001LF/609-4613-1-ND/2785378)
+P2|Female|[S7004-ND](https://www.digikey.no/product-detail/en/sullins-connector-solutions/PPTC061LFBN-RC/S7004-ND/810145)
+P3|Male|[952-2262-ND](https://www.digikey.no/product-detail/en/harwin-inc/M20-9990246/952-2262-ND/3728226)
+P4||[609-1047-ND](https://www.digikey.no/product-detail/en/amphenol-fci/54602-910LF/609-1047-ND/1001361)
+Q1|BC337|[BC33725TACT-ND](https://www.digikey.no/product-detail/en/fairchild-on-semiconductor/BC33725TA/BC33725TACT-ND/1532787)
+R1-5,10,11|10K|[CF14JT10K0CT-ND](https://www.digikey.no/product-detail/en/stackpole-electronics-inc/CF14JT10K0/CF14JT10K0CT-ND/1830374)
+R8|100K|[CF14JT100KCT-ND](https://www.digikey.no/product-detail/en/stackpole-electronics-inc/CF14JT100K/CF14JT100KCT-ND/1830399)
+R9|330R|[CF14JT330RCT-ND](https://www.digikey.no/product-detail/en/stackpole-electronics-inc/CF14JT330R/CF14JT330RCT-ND/1830338)
+R12,13|47K|[CF14JT47K0CT-ND](https://www.digikey.no/product-detail/en/stackpole-electronics-inc/CF14JT47K0/CF14JT47K0CT-ND/1830391)
+S1,2||[450-1650-ND](https://www.digikey.no/product-detail/en/te-connectivity-alcoswitch-switches/1825910-6/450-1650-ND/1632536)
+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)
+U3|LM358|[LM358NGOS-ND](https://www.digikey.no/product-detail/en/on-semiconductor/LM358NG/LM358NGOS-ND/918519)
+
+Note: The ESP8266 is not included here. It can easily be found on ebay etc

README.md

@@ -1,5 +1,8 @@
 # AMS <-> MQTT Bridge
 
+* [Electrical design](./Electrical)
+
+## Background
 The purpose of this project is to collect information and build a simplified bridge for reading serial DLSM/M-bus information from electrical power meters (AMS), provided over the HAN port, and publishing to some IoT friendly target.
 
 Components will be ESP8622, Arduino code, a (very simplified) M-bus <-> 3.3V serial interface
@@ -14,7 +17,7 @@ The project should include:
 - [x] [Documentation on HAN / MBus / DLMS/COSEM](/Documentation)
 - [X] Code to parse DLMS data into a structure
 - [X] Real schematics, including ESP8266
-- [ ] PCB layout
+- [X] PCB layout
 - [ ] Arduino library
 - [X] Arduino sample sketch to read values and report to MQTT server