Nettigo Air Monitor HECA (Heating Element Control Assembly)

2 years ago

Open source license: TAPR Open Hardware License

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Description

PTC Heating Element Control

In this design we used precise temperature and humidity sensor from Sensirion: SHT30 or SHT31 connected via I2C. Sensors are equipped with ALERT output. This output is connected to N-channel MOSFET and controls PTC Heating Element. Huge advantage of this design is ALERT logic which can be programmed via I2C and it's independent from main micro controller. In other words apart of sensor initialization it doesn't require any action from main micro controller.

Usage

  • PTC Heating element connect to connector marked as PTC HE (from SHT side)
  • I2C cable connect to SCL, SDA, 3V3 and GND
  • Heating element power supply connect to PTC and GND. PTC is positive terminal. Heating element supports from 5V to 12V.
  • I2C address is set to 0x44 permanently. On this board layout this address can not be changed. Track between SHT address pin is connected to GND directly under sensor chip itself.

Project support

If you would like to support this project consider buying assembled module form Nettigo.pl or Nettigo.eu.

License

  • This project is licensed under TAPR Open Hardware License.
  • Project author: Krzysztof Daszuta (Nettigo.pl)
  • Project founder: Witold Rugowski (Nettigo.pl)

Documents

Nettigo Air Monitor HECA

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Nettigo Air Monitor HECA 0.1.0 (D30)

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Nettigo Air Monitor HECA 0.1.1 (D29)

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Nettigo Air Monitor HECA 0.1.2 (D29)

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Nettigo Air Monitor HECA 0.1.3 (D29)

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BOM

ID Name Designator Footprint Quantity BOM_Manufacturer Part
1 100nF C1 0603 1 CC0603KRX7R9BB104
2 Nettigo HE Connector H1 NETTIGO HE CONECTOR 1 ?
3 HE OUT H2 NETTIGO PTC HE 1 2.54-1*2PFemale
4 DMG3420U-7 Q2 SOT-23(SOT-23-3) 1 DMG3420U-7
5 10KΩ R1,R2,R3 0603 3 0603WAF1002T5E
6 Nettigo SHT30-DIS-F U1 NETTIGO SHT30-DIS-F 1 SHT30-DIS-F

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