mirror of https://github.com/arendst/Tasmota.git
Updated Expanding 4CH (markdown)
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@ -14,10 +14,10 @@ The schematic reports that 2.5 mm jack is configured as following (jack on right
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3.3V and GND are very welcome for sensors expansions but GPIO7 and GPIO8 are not usable because they are used internally by ESP8255 for flash memory connection (sigh!)
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3.3V and GND are very welcome for sensors expansions but GPIO7 and GPIO8 are not usable because they are used internally by ESP8255 for flash memory connection (sigh!)
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R35 and R36 resistors are not soldered on Sonoff 4CH PCB and it is possible to use them to "manually route" the jack contact on another ESP2855 pin (!). I selected R35 pad because my "waterproof" DS18B20 sensors provide signal line on TEM1 jack contact.
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R35 and R36 resistors are not soldered on Sonoff 4CH PCB and it is possible to use their pads to "manually route" the jack contact on another ESP2855 pin (!). I selected R35 pad because my "waterproof" DS18B20 sensors provide signal line on TEM1 jack contact.
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For ESP8255 pin I prefer IO2 that is already available on header programming pins...
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For ESP8255 pin I prefer IO2 that is already available on header programming pins...
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Then the route to do is: TEM1 -> R35 pad -> IO2:
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Then the route to do is: TEM1 -> R35 pad -> GPIO2:
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| ![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/r35-zoom.jpg) |![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/r35.jpg) |
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| ![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/r35-zoom.jpg) |![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/r35.jpg) |
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@ -25,8 +25,17 @@ Then the route to do is: TEM1 -> R35 pad -> IO2:
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|![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/sf4ch-pcb-rear.jpg)|![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/rear-zoom.jpg)|
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|![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/sf4ch-pcb-rear.jpg)|![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/rear-zoom.jpg)|
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DS18B20 sensors need a 4.7Kohm pullup resistor between DATA pin and 3.3V and this is also useful to pullup GPIO2 in order to avoid ESP8255 reset.
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Final result in these photos:
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|![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/final-jack.jpg) |![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/final-result.jpg) |
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Sonoff-Tasmota is also configured with DS18x20 on GPIO2 and it works !
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|![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/Sonoff-Configure-Module.png)|![](https://github.com/gtortone/Sonoff-Tasmota/blob/development/_temp_imgs/Sonoff-Main-Menu.png)|
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