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STD Temperatur Humidity Sensor SHT21
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License: Public Domain
Description
**General**
Powered by 2 AA Batteries Size 20 x 45 (mm) Almost SMD 0805 Atmel328p TQFP32 NRF24I01 smd ATSHA204A chip FLASH for OTA FTDI, ISP SHT21 Sensor
**Description**
The Sensor works directly on two AA Batteries or Ni-MH.
**Settings**
Use Sensebender Micro bootloader Set Fuses before upload bootloader FUSES: L: 0XDE // H: 0XD2 // E: 0X07 (disabled BOD/8Mhz external clock) Set Fuses again, arduino IDE will override it with the default sensebender fuses or modify the board settings in Arduino IDE
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Quantity |
|---|---|---|---|
| 1 | 470k | R10 | 1 |
| 2 | ATMEGA328P-AU | U1 | 1 |
| 3 | RST | F,F1 | 2 |
| 4 | 100n | C4,C5,C6,C7,C8,C2,C1 | 7 |
| 5 | 10k | R3 | 1 |
| 6 | DTR | F2 | 1 |
| 7 | IC_ATSHA204A_CRYPT | U3 | 1 |
| 8 | NRF24SMD | U$2 | 1 |
| 9 | 56k | R7,R4 | 2 |
| 10 | NRF_CSN | F4 | 1 |
| 11 | SPST.B3U-1000P(M) | RESET | 1 |
| 12 | 1M | R11 | 1 |
| 13 | C0 | F5 | 1 |
| 14 | JST_VERTICAL | AVR_ISP,FTDI | 2 |
| 15 | IC_EEPROM | U2 | 1 |
| 16 | 4k7 | R1,R2 | 2 |
| 17 | 100u | C3 | 1 |
| 18 | CONNECTOR_2DUPONT | U$1 | 1 |
| 19 | SHT21 | SN1 | 1 |
| 20 | CSTCE | U$3 | 1 |
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