WS1209 Reverse

# Info WS1209

Generic Chinese low-cost temperature control board with the following features:

* Microcontroller [STM8S003F3][DS1] with SWIM interface
* Molex connector for 10k NTC
* 3 digit 7s LED [2381AS][DS3]
* [AMS1117-5.0][DS2] 5V regulator
* Relay 12V - 125V / 20A with control LED

## Connection STM8S003F3

![STM8S003F](./STM8S003F3.png)
Pin|STM|Connected to|Pin|STM|Connected to
-|-|-|-|-
1|PD4 |DIG1 (200R) | 20| PD3|7S-D
2|PD5|7S-A| 19|PD2|7S-DP
3|PD6/AIN6|5V - [Rref 20k - Ain - NTC][L1] - GND| 18|PD1/SWIM|7S-E / Prog Pin2
4|NRST|Prog Pin3| 17|PC7| 7S-C
5|PA1|7S-F| 16|PC6|7S-G
6|PA2|7S-B| 15|PC5| Key "-"
7|VSS|+5V| 14|PC4| Key "+"
8|Vcap|C| 13|PC3| Key "set"
9|VDD|GND| 12|PB4|DIG3 (200R)
10|PA3|Relay (2k/10k - NPN, Relay, LED)| 11|PB5|DIG2 (200R)

## SWIM Interface
Pin|Name
-|-
1|VSS +5V
2|SWIM
3|NRST
4|GND

## HS2381AS 3 Digit-7S LED Display
![HS2381AS ](./HS2381AS_face.png)
![HS2381AS ](./HS2381AS_schem.png)

[L1]: https://www.embeddedrelated.com/showarticle/91.php
[DS1]: http://www.st.com/content/ccc/resource/technical/document/datasheet/42/5a/27/87/ac/5a/44/88/DM00024550.pdf/files/DM00024550.pdf/jcr:content/translations/en.DM00024550.pdf
[DS2]: http://pdf1.alldatasheet.com/datasheet-pdf/view/205692/ADMOS/AMS1117-5.0.html
[DS3]: http://www.datasheetarchive.com/dl/Datasheets-SW20/DSASW00381761.pdf