mirrors
/
Tasmota
mirror of https://github.com/arendst/Tasmota.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Updated Sonoff Pow (markdown)

Thomas Dietrich 2017-05-31 20:19:44 +02:00
parent e3c757bb2a
commit 4eae2c82f4
1 changed files with 9 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
Sonoff-Pow.md

@ -1,16 +1,15 @@
### Sonoff Pow
<!-- this can be deleted. General warning now given above --> * Itead Product Page: http://sonoff.itead.cc/en/products/sonoff/sonoff-pow
* Itead Shop: https://www.itead.cc/sonoff-pow.html
* Itead Wiki: https://www.itead.cc/wiki/Sonoff_Pow
Trying to program the Sonoff Pow [comrade MySKU](http://mysku.ru/blog/china-stores/45762.html) learned the hard way how to brick it. ## Serial Connection
<img alt="Sonoff Pow Bricked" src="https://github.com/arendst/arendst.github.io/blob/master/media/pow1.jpg" width="230" align="right" /> <img alt="picture of the Sonoff Pow PCB, the needed pin header can be seen on the top end" src="https://www.itead.cc/wiki/images/e/e3/Sonoff-Pow-00.JPG" width="40%" align="right" />
As the Sonoff Pow power monitoring hardware connects AC power to the logic ground of the ESP8266 it is utterly mandatory to **NOT CONNECT AC POWER WHILE SERIAL CONNECTION IS BEING USED**.
During both AC connection and Serial connection you may connect the life AC wire with your PC's DC ground leading to a power short, broken Sonoff Pow and laptop Power Supply as MySKU has experienced. Please see the [Hardware Preparation](https://github.com/arendst/Sonoff-Tasmota/wiki/Hardware-Preparation) page for general instructions.
A solution that works for me is shown in the schematic below using two opto couplers seperating the AC connection on the **left** from the low voltage connection on the **right**. This allows for serial control at 115200 baud and uploading of firmware up to 57600 baud while AC is connected. As always, you need to access the serial interface. The **four serial pins** (3V3, Rx, Tx, GND) are available at the rear/short end of the PCB as can be seen in the upper part of the image to the right.
<img alt="OptoSerial" src="https://github.com/arendst/arendst.github.io/blob/master/media/OptoSerial.jpg" />
## Calibration ## Calibration
Sonoff Pow might need calibration as correct measurements are influenced by hardware and timing differences. Sonoff Pow might need calibration as correct measurements are influenced by hardware and timing differences.
@ -18,8 +17,8 @@ Sonoff Pow might need calibration as correct measurements are influenced by hard
I used the following procedure to calibrate. I used the following procedure to calibrate.
1. Prerequisites 1. Prerequisites
- Calibrated multimeter ;-) - Calibrated multimeter :wink:
- Optional calibrated power meter ;-) - Optional calibrated power meter :wink:
- 60W light bulb - 60W light bulb
2. Connect the Pow to the optional power meter. 2. Connect the Pow to the optional power meter.
3. Connect the 60W light bulb 3. Connect the 60W light bulb