For the sensor :
- Arduino Mini Pro 5v
- DS18B20 Module for temperature detection
- Emiter RF 433 Mhz
- Antenna
- 9V Battery Case
For the computing system :
- Raspberry Pi B+
- Receiver RF 433 Mhz
- Antenna
- Wall Plug Power Source
- Wifi Dongle
In order to program the Arduino Mini Pro i think i will go with a USB to TTL serial adapter FT232RL.
I am about to order all those parts online...
Hi,
ReplyDeletehow do you power the Arduino Mini Pro 5v, as the battery is 9V. How do you reduce/convert the voltage?
Thank's for you article, it's very intersteing.
best Regard's
Gael
Hi Gael, good question. Actually the Arduino auto regulates the voltage from 9V to 5V so you have to provide at least 5V but if there is slightly more this is still working.
ReplyDeleteIt becomes more tricky if you have a battery with less voltage (i.e. 3,7 V lithium) and then you need to boost the power with an additional circuit. This is my plan for future improvement and have a 'rechargeable' design
HI,
ReplyDeletethanks, that what i found on my research.
With this design, how many time did the 9V battery work?
Now i'm waiting my element to start this projet, based on your blog, but I'm also thinking/looking for a solution with battery and solar pannel (for an exterior sensor).
Best Regard's
I can't tell what is the overall autonomy, but i have to admit that this is not a sustainable solution. If you want to leave the sensor in a room, i am afraid it won't last more than a couple a days. The issue has to do with my code most probably which is taking the temperature and sends it over RF every 10 seconds or so ... i should optimize the overall code and put a rechargeable battery (to avoid wasting money on battery)
DeletePlease share what will be your setup with the solar pannel, i am highly interested ! So far this is for inside, but it would good to have a fully independant setup for outside !