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Updated Sonoff Pow (markdown)

Thomas Dietrich 2017-05-31 20:19:44 +02:00
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Sonoff-Pow.md

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### 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" />
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**.
<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" />
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.
<img alt="OptoSerial" src="https://github.com/arendst/arendst.github.io/blob/master/media/OptoSerial.jpg" />
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.
## Calibration
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.
1. Prerequisites
- Calibrated multimeter ;-)
- Optional calibrated power meter ;-)
- Calibrated multimeter :wink:
- Optional calibrated power meter :wink:
- 60W light bulb
2. Connect the Pow to the optional power meter.
3. Connect the 60W light bulb