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Std edition 4-20 ma modbus sensor node
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License: MIT
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.
design drawing
schematic diagram
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| 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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