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https://github.com/mongoose-os-apps/12V-8Port-Switch
ESP8266 based 12V 8gang FET driver with current sensor
https://github.com/mongoose-os-apps/12V-8Port-Switch
Last synced: about 2 months ago
JSON representation
ESP8266 based 12V 8gang FET driver with current sensor
- Host: GitHub
- URL: https://github.com/mongoose-os-apps/12V-8Port-Switch
- Owner: mongoose-os-apps
- Created: 2019-06-05T09:01:31.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2020-08-20T19:02:42.000Z (about 4 years ago)
- Last Synced: 2024-07-03T14:32:26.329Z (3 months ago)
- Language: C
- Size: 1.68 MB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
- awesome-mongoose-os - 12V-8Port-Switch - ESP8266 based 12V 8gang FET driver with current sensor (Awesome Mongoose OS [](https://awesome.re) / Official Examples)
README
# ESP8266 based 12V switch
This is a project that uses an ESP8266 to drive 8x MOSFET power ports, rated at 2A each. It incorporates a GPIO buffer (based on [MCP23008](docs/mcp23008.pdf)) to allow the MCU to reboot without changing the port status, and a current sensor (based on [INA219](docs/ina219.pdf)) to measure total current through the device.
## Hardware
The schematic and board layout are in the [eagle/](eagle/) directory. You can order this board from [Oshpark](https://oshpark.com/shared_projects/42dmo9fg).
Logical components in the hardware are:
* An LDO that steps down 12V input to 3.3V, with power LED
* An INA219 on I2C that senses current using a 0.01 Ohm shunt resistor (32A max in 80mA steps)
* An MCP23008 8-port GPIO expander on I2C
* 8 output ports, driven by IRLML6244 mosfets (3A max per channel)
* An ESP8266-12E which drives the current sensor and GPIO expander over I2C
* RST and GPIO0 are provided via pushbuttons
* Headers:
* I2C breakout for additional sensor(s)
* 4x GPIO breakouts (GPIO: 4, 5, 9, 10)
* Serial access to flash the ESP8266
### BOM
Bill of materials with components and sizes:
* AM1117-3.3V
* C1, C2: 10uF Tantalum (3216)
* C3: 470pF ceramic (0805)
* IC1: MCP23008 (SO18W)
* IO0/RST: momentary switch (6mm x 3.5mm)
* J1-J9: screw terminal (0.2" pitch)
* J10,J11: 4-pin standard header (0.1" pitch)
* J12-15: 3-pin standard header (0.1" pitch)
* MDL1: ESP8266-ESP12E
* PWR: Green LED (0805)
* Q1-Q8: IRLML6244 (SOT23)
* R1-R8: 1kOhm (0805)
* R9-R10, R12-16: 10kOhm (0805)
* R11: 330Ohm (0805)
* R17: 0.01Ohm Shunt (2515)
* U1: INA219 (SOT23-8)
## Software
We use drivers for [INA219](https://github.com/mongoose-os-libs/ina219-i2c/) and [MCP23008](https://github.com/mongoose-os-libs/mcp23xxx) which are readily available for Mongoose OS. For telemetry export, we use [Prometheus](https://github.com/mongoose-os-libs/prometheus-metrics) to export metrics including standard telemetry from the ESP8266 as well as custom metrics such as port state, current and voltage.
Using the Mongoose OS [RPC Subsystem](https://github.com/mongoose-os-libs/rpc-common), we expose a simple control surface to query the ports, switch them on/off or toggle them.
By default, HTTP endpoints are provided for metrics and RPCs, which can be a security hazard. For non-trusted wifi environments, we allow allow the device to close all serving ports and service RPCs via [Pubsub](https://github.com/mongoose-os-libs/mqtt) using TLS connections to a remote [Mosquitto](https://mosquitto.org/) endpoint. Metrics can be pushed via POST requests to a Prometheus [pushgateway](https://github.com/prometheus/pushgateway).
Firmware updates can be performed [over-the-air](https://github.com/mongoose-os-libs/ota-http-client), using both HTTP as well as MQTT transport.
### API