add pictures and a little more text

parent 01e67d93
......@@ -20,6 +20,9 @@ FHEM, a popular non-commercial and cloud-free home-automation software.
A FHEM module for feeding temperature data from foxtemp2016 devices into
FHEM can also be found in this repository.
![a fully assembled foxtemp2016 device in its case](pics/foxtemp2.jpg)
![the core of a foxtemp2016 device](pics/foxtemp1.jpg)
## Hardware
### Intro
......@@ -45,11 +48,18 @@ together. The bill of materials therefore is short:
board serves perfectly as what would be called a "shield" in the Arduino
world: It's plugged/stacked on top of the microcontroller board.
* a voltage divider for measuring the current voltage of the batteries, so you
can tell how full they are.
can tell how full they are. You cannot directly connect the batteries
to an ADC pin of the microcontroller, because that runs at 3.0 volts,
and two AA batteries when full are more like 3.2 volts. Of course, when
you modify the design to use a power source that is guaranteed to have
less than 3.0 volts at all times, you can skip that voltage divider and
just connect power to PA2. You'll also have to make changes on the
receiver software side, because that expects the values received to
be on a scale of 0 to 3.3 volts, not 0 to 3.0 volts.
* resistor 10 MOhm
* resistor 1 MOhm
* small capacitor. Everything >= 1 nF should be just fine, I used 100 nF
because I had that lying around.
because I had that lying around.
* Goobay 78467 battery tray. This is simply a battery holder for two
AA batteries that has cables attached.
* an additional 100 uF capacitor for stabilizing power, simply soldered
......@@ -66,6 +76,9 @@ FIXME
## Case
![the lasercut parts for one case](pics/case1.jpg)
![case almost fully assembled with the foxtemp2016 device and batteries inside](pics/case2.jpg)
A reference design for a laser-cut case that will fit the sensor construction
and the batteries is also included. You can find the DXF file in the subdirectory
`case`. It's based on a
......
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