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Std Edition4-20 ma modbus sensor node

License: MIT

Published Time:2019-05-05 19:44:14
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Description

Using an ESP8266 MCU Sensor Data from multiple 4-20 mA Sensors and Serial MODBUS sensors is send to the cloud via WiFi. The PCB has built in Battery Charging and a Charge Protection Circuit.

4-20 mA sensor output is measured with a INA219 and read over I2C. MODBUS singles over RS232 DB9 Connector are read with the help of MAX3232. The Battery Management system consists of MCP73831 and AP2112K.

Cover Icon Accreditation: Icons made by Freepik from Flaticon is licensed byCreative Commons BY 3.0. Inspired by Sparkfun ESP8266-Thing.

Documents
ID Name Designator Footprint Quantity
1 1.0uF C7 0805 1
2 2.2uF C10 0603 1
3 BAT20J D2 SOD-323 1
4 10k R7 0603 1
5 AP2112K-3.3V U3 SOT23-5 1
6 2.5A/30V Q1 SOT23-3 1
7 RED D3 LED-0603 1
8 JUMPER-PAD-2-NC_BY_TRACE SJ2,SJ1 PAD-JUMPER-2-NC_BY_TRACE_YES_SILK 2
9 1K R4,R3 0603 2
10 MCP73831 U1 SOT23-5 1
11 4.7uF C6,C19 0603 2
12 LiPo JP2 JST-2-PTH 1
13 Yellow D1 LED-0603 1
14 2.0k R6 0603 1
15 DNP R5 1/6W-RES 1

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