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Hardware

Inleiding

Bedoeling is dus om te proberen of we met behulp van de twee sensoren met een gas-gevoelige impedantie het mogelijk is om geurhinder te meten.

bill of materials

foto beschrijving bestellen
foto Raspberry PI 3B+ pack KIWI electronics
foto RPI prototype hat AliExpress
foto TGS2600 en TGS2602 sensors AliExpress
foto DS3231-Precision-RTC breakout board AliExpress
foto ADS1115, LNA+ADC breakout board AliExpress
foto 2.54mm single row 4 pin and 8 pin female header AliExpress

Raspberry pi 3B+

Dit is de computer die de sensoren uitleest en gegevens lokaal opslaat. Best wel een krachtig apparaat om enkel sensoren uit te lezen. Kan goedkoper met bv. een arduino, maar de pi is oh zo handig in gebruik.

  • Broadcom BCM2837B0, Cortex-A53 (ARMv8) 64-bit SoC @ 1.4GHz
  • 1GB LPDDR2 SDRAM
  • 2.4GHz and 5GHz IEEE 802.11.b/g/n/ac wireless LAN, Bluetooth 4.2, BLE
  • Gigabit Ethernet over USB 2.0 (maximum throughput 300 Mbps)
  • Extended 40-pin GPIO header
  • Full-size HDMI
  • 4 USB 2.0 ports
  • CSI camera port for connecting a Raspberry Pi camera
  • DSI display port for connecting a Raspberry Pi touchscreen display
  • 4-pole stereo output and composite video port
  • Micro SD port for loading your operating system and storing data
  • 5V/2.5A DC power input
  • Power-over-Ethernet (PoE) support (requires separate PoE HAT)

Meer details op https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/

sensors

TGS2600 TGS 26002
TGS2600 TGS2602
Target gases Air contaminants (hydrogen, ethanol, etc.) Air contaminants (VOCs, ammonia, H2S, etc.)
Typical detection range 1 - 30ppm of H2 1 - 30ppm of EtOH
Sensing principle MOS type Precautions for use MOS type Precautions for use
Heater Voltage 5.0V 5.0V
Circuit Voltage 5.0V 5.0V
Power consumption 210mW 280mW
Dimensions φ9.2×7.8mm φ9.2×7.8mm
Weight Approx. 1.1g Approx. 1.1g
product information product information
product page product page

ADS1115

http://www.ti.com/product/ADS1115

introduction

The ADS1113, ADS1114, and ADS1115 devices (ADS111x) are precision, low-power, 16-bit, I2C-compatible, analog-to-digital converters (ADCs) offered in an ultra-small, leadless, X2QFN-10 package, and a VSSOP-10 package. The ADS111x devices incorporate a low-drift voltage reference and an oscillator. The ADS1114 and ADS1115 also incorporate a programmable gain amplifier (PGA) and a digital comparator. These features, along with a wide operating supply range, make the ADS111x well suited for power- and space-constrained, sensor measurement applications.

The ADS111x perform conversions at data rates up to 860 samples per second (SPS). The PGA offers input ranges from ±256 mV to ±6.144 V, allowing precise large- and small-signal measurements. The ADS1115 features an input multiplexer (MUX) that allows two differential or four single-ended input measurements. Use the digital comparator in the ADS1114 and ADS1115 for under- and overvoltage detection.

The ADS111x operate in either continuous-conversion mode or single-shot mode. The devices are automatically powered down after one conversion in single-shot mode; therefore, power consumption is significantly reduced during idle periods.

Features

  • Ultra-Small X2QFN Package:
  • 2 mm × 1.5 mm × 0.4 mm
  • Wide Supply Range: 2.0 V to 5.5 V
  • Low Current Consumption: 150 µA
  • (Continuous-Conversion Mode)
  • Programmable Data

functional diagram

ADS111x functional diagram