2000mAh
LiPo battery
🌵 Indoor WiFi-connected temperature and humidity sensor 🍶
Item | Height | Width | Depth | Weight |
---|---|---|---|---|
Name card holder box enclosure | 90 mm |
55 mm |
25 mm |
|
PCB | 76 mm |
38 mm |
2 mm |
|
WeMos D1 Mini V3.0.0 pcb fit | 34.2 mm |
25.6 mm |
2 mm |
3 g
|
WeMos Battery shield pcb fit | 34.2 mm |
25.6 mm |
2 mm |
|
Adafruit Si7021 Breakout Board pcb fit | 17.8 mm |
15.3 mm |
3 mm |
1 g
|
500mAh LiPo
pcb fit
|
36 mm |
29 mm |
4.75 mm |
10.5 g
|
500mAh LiPo
pcb fit
|
43 mm |
25 mm |
8 mm |
|
2000mAh LiPo
pcb fit
|
60 mm |
36 mm |
7 mm |
34 g
|
2000mAh LiPo
|
80 mm |
70 mm |
4 mm |
|
2500mAh LiPo
|
65 mm |
51 mm |
8 mm |
52 g
|
Edit
state_machine.md
at mermaid js live editor.
Power source
2000mAh
LiPo battery
Battery life
Charging duration
Red
LED will be on while it is charging.Green
LED will be on when charging is complete.
Edit
power_tree_drawio.xml
at draw.io.
Chip # | Chip | Operating Voltage | Active mode | Modem-sleep mode | Deep-sleep mode | Total |
---|---|---|---|---|---|---|
ESP8266 | WiFi based MCU | 3.3V |
170mA |
15mA |
10uA |
|
Si7021 | Temperature / Humidity sensor | 1.9V - 3.6V |
150uA |
60nA |
||
SN4HC595 | Shift register | 2V - 6V |
60uA |
1uA |
||
Total consumption | 170.23mA |
15mA |
11.06uA |
|||
Total duration | 30s. | 10s x 12 = 120s. | 4h. | 4h. | ||
Total charge | 30/14400 * 170.21m = 0.354 mAs |
120/14400 *15m = 0.125mAs |
14250/14400 * 11.06u = 0.011mAs |
0.589mAs |
3 power modes:
1200mAh
battery will last for (1200/24/30)
= 2.89 months
Mode | Pins | Voltage |
Deep sleep | 5V - GND on WeMos D1 mini |
4.94V |
Deep sleep | Vin - GND on Si7021 breakout board |
5V |
Deep sleep | Vcc - GND on 74HC595 chip |
5V |
Deep sleep | EN - GND on 74HC595 chip |
Periodic wakeup | Calculated | Actual | Error % |
6 hours | 2.89 months | 30 days | ~300% ⁉️ |