Flashing Tasmota on Sonoff S31 Lite Smart Plug
12#SonoffS31 #Tasmota #HomeAutomation
Full steps can be found at https://i12bretro.github.io/tutorials/0731.html
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What is Tasmota?
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[Tasmota is an] alternative firmware for ESP8266/ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP, Serial or KNX. - https://github.com/tasmota/install
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Things You Will Need
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- Sonoff S31 Smart Plug(s) https://amzn.to/38l6jes
- CP2102 Serial to USB adapter https://amzn.to/3uPgBeg
- Minigrabber Probe Test Leads (Optional, but removes the need to solder) https://amzn.to/3iWdcVC
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Preparation
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01. Download Tasmotizer https://github.com/tasmota/tasmotizer/releases
02. Download CP2102 Windows drivers https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers
03. Extract the downloaded CP2102 zip
04. Plug the CP2102 USB adapter into an available USB port
05. Right click the Start button ≫ Device Manager
06. Expand Other devices and locate the CP2102 ≫ Right click on it ≫ Update driver
07. Select Browse my computer for drivers
08. Click the Browse... button ≫ Browse to and select the extracted CP2102 driver files
09. Check the Include subfolders box ≫ Click Next
10. Wait while the driver is installed
11. Take note of the COM port assigned to the CP2102 adapter
12. CRUCIAL STEP: Unplug the CP2102 USB adapter
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Disassembly and Wiring
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01. Disassemble the Sonoff S31 plug by gently prying the gray end cap/power button with a spudger and sliding the two rounded plastic pieces off to reveal 3 screws
02. Remove the 3 screws and flip the S31's PCB over
03. Using the minigrabber probes (or by soldering wires from the S31's PCB to the CP2102 USB adapter, make the connections shown below
The CP2102 adapter should NOT be plugged in at this point FULL STEPS ON GITHUB LINK ABOVE
04. After verifying the connections 3 times, hold down the button the S31 PCB and plug the CP2102 adapter into an available USB port on the PC
05. Continue holding the button on the S31 PCB for approximately 5 seconds to boot the plug into programming/flashing mode
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Flashing Tasmota
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01. Launch the Tasmotizer .exe
02. Set the Select port field to the COM port of the CP2102 USB adapter
03. For the first S31 device, check the Save original firmware box and set the Flash size to 4MB
04. Select Release under image to have Tasmotizer download the latest release of Tasmota
05. Verify Erase before flashing is checked
06. Click the Tasmotize! button
07. Wait while Tasmotizer backs up the stock S31 firmware
08. When prompted, power cycle the plug by unplugging the CP2102 USB adapter from the PC, holding down the button on the S31 PCB and plugging the CP2102 USB adapter back into the PC
09. Continue holding the button on the S31 PCB for approximately 5 seconds to boot the plug into programming/flashing mode
10. Click OK on the Tasmotizer dialog to continue with the flashing process
11. Wait until Tasmotizer has completed the flash and prompts to restart the device
12. Unplug the CP2102 USB adapter from the PC and plug it back in, this time without holding the button the S31 PCB
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Connecting to Wifi and Configuration
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01. From a wifi enabled device (ie laptop/smart phone), look at the available wifi networks and connect to the tasmota- SSID
02. Open a web browser and navigate to 192.168.4.1
03. Enter the Wireless network SSID and password ≫ Click Save
04. The S31 will attempt to connect to the Wireless network and upon connection will redirect to the new IP address
05. Welcome to Tasmota on the Sonoff S31 smart plug
06. Select Configuration ≫ Configure Module ≫ Set the module to Sonoff S31 ≫ Click Save
07. Back on the Configuration menu, click Configure Other ≫ Set the device Name and Friendly Name ≫ Save
Further reading: https://tasmota.github.io/docs/devices/Sonoff-S31/
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