Pine

V1.0

🌲 Control aircon by monitoring temperature in other parts of the room 🎐

power AA
wireless Infrared
sensor Temperature
mcu SAMD21G
bom items 49
bom cost USD $9.71
vendors 2
status ongoing

Power tree schematic

Edit power_tree_drawio.xml at draw.io.

Power Tree schematic

Main components

Chip # Description Operating Voltage Output Voltage
SAMD21G MCU 1.62V to 3.63V
TSOP4383 IR Receiver 2.5V to 5.5V
SIR-56ST3F IR LED Emitter 1.3V to 1.6V
Si7021-A20 Temperature and humidity sensor 1.9V to 3.6V
LD3985 Low dropout voltage regulator 2.5V to 6.0V 1.22 V, 1.8 V, 2.5 V, 2.6 V, 2.7 V, 2.8 V, 2.9 V, 3 V, 3.3 V, 4.7 V

Circuit simulation

Simulation of the power management circuit with Falstad [File > Import from Text].


Download code
$ 1 0.000005 10.20027730826997 53 5 43
R 48 192 48 128 0 0 40 5 0 0 0.5
s 48 192 160 192 0 0 false
x -22 190 27 193 4 24 USB
r 336 192 448 192 0 1000
g 448 192 448 240 0
f 320 352 320 304 41 1.5 0.02
w 240 352 320 352 0
w 336 256 336 304 0
R 48 304 48 272 0 0 40 3 0 0 0.5
s 64 304 160 304 0 0 false
w 224 304 304 304 0
r 320 352 448 352 0 10000
g 448 352 448 384 0
d 240 192 304 192 2 default
w 304 192 336 192 0
d 336 256 336 208 2 default
w 336 208 336 192 0
w 240 192 240 352 0
x -46 298 27 301 4 24 battery
w 160 192 240 192 0
w 160 304 224 304 0
w 64 304 48 304 0
Power management circuit simulation