2 layers67 × 122 mm
Gasmeter handheld device
cs99x/GasMonitorLoRaCloud
This project is a mobile and embedded application for a university course called "Mobile and Embedded Development".
76 parts
2 layers100 × 100 mm
Gas sensor
Hackuarium/gas-sensor1Arduino compatible gas sensor
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 37
- Nets
- 34
- Pads
- 158
- Tracks, vias
- 389, 43
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 4 Dec 2018
- Updated
- 31 May 2019
Overview
Gas sensor is an open-source printed circuit board by Hackuarium, from the Hackuarium/gas-sensor repository on GitHub. It is a 2-layer board of 100 × 100 mm with 37 parts on 34 nets, routed with 389 tracks and 43 vias.
It is built around the ATMEGA328P-AU, DHT22 and DS18B20, with the MQ-4 among its other parts. Its parts include 7 capacitors, 7 connectors, 6 resistors, 4 ICs and 3 diodes. It belongs with the sensors and measurement boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
4
ATMEGA328P-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
DHT22
插件-40℃~+80℃ 3.3V 5%RH~99%RH 500uA ±3%RH 插件 Temperature and Humidity Sensor ROHSHAIGUTemperature And Humidity Sensor
DS18B20
TO-92-55℃~+125℃ 12bit 3V~5.5V 750ms Single-bus ±0.4℃ TO-92 Temperature Sensors ROHSUMWTemperature SensorsMQ-4
插件插件 Gas Sensors ROHSZhengzhou Winsen Elec TechGas Sensors
README
README.mdgas-sensor
The goal is to create a box allowing the determination of the gas composition of a bioreactor. The sensor that will be available are: CO2 (MH-Z19), H2 (MQ-8) and methane (MQ-4) as well as temperature (DS18B20) and humidity (DHT-22).
The board will be compatible with arduino Lilapad Pro using a dedicated PCB.
Need to compensate for humidity and temperature ???
Cloning the project
This project uses SUBMODULES
In order to clone use:
git clone --recurse-submodules https://github.com/hackuarium/gas-sensor
To update the submodules
git submodule update --recursive --remote
Sensors
| name_pin | function | model | Arduino library | |
|---|---|---|---|---|
| CH4 | CH4 | MQ-4 | ||
| H2 | H2 | MQ-8 | ||
| CO2 | CO2 | MH-Z19 | 3.3v (for RX / TX) + 5v!!!! | https://github.com/crisap94/MHZ19 |
| TEMP | temperature | DS18B20 | ||
| HUM | humidity | DHT-22 | https://github.com/adafruit/DHT-sensor-library |
Gaz sensor: http://www.china-total.com/Product/meter/gas-sensor/Gas-sensor.htm
Gaz sensor on sparkfun: https://www.sparkfun.com/products/8891 https://www.sparkfun.com/products/9404
Gaz sensor on mysensors: https://www.mysensors.org/build/gas
Drying the air / pumping Particulate or Coalescing Filters http://www.pneumaticplus.com/pneumaticplus-saf4000-series-particulate-air-filter-1-2-npt-with-bracket/ https://www.aliexpress.com/item/15L-M-12V-dc-electric-diaphragm-brush-small-air-compressor-pump/1790013118.html
Fans
https://www.pelonistechnologies.com/micro-fans
Pneumatic https://www.alibaba.com/product-detail/A102-China-sup
Pinout
| n° Arduino | port | pin | ||
|---|---|---|---|---|
| A0 | PC0 | A0 | H2 | |
| A1 | PC1 | A1 | H2_ON | |
| A2 | PC2 | A2 | CO2_RX | |
| A3 | PC3 | A3 | CO2_TX | |
| A4 | PC4 | SDA | Slave I2C | |
| A5 | PC5 | SCL | Slave I2C | |
| A6 | ADC6 | A6 | CH4 | |
| A7 | ADC7 | A7 | CH4_ON | |
| 0 | PD0 | RX | FTDI | |
| 1 | PD1 | TX | FTDI | |
| 2 | PD2 | D2 | / | |
| 3 | PD3 | D3 | PWM_MH-Z19 | PWM |
| 4 | PD4 | D4 | TEMPERATURE | |
| 5 | PD5 | D5 | HUMIDITY | PWM |
| 6 | PD6 | D6 | LCD RS | PWM |
| 7 | PD7 | D7 | / | |
| 8 | PB0 | D8 | LCD E | |
| 9 | PB1 | D9 | LCD LED | PWM |
| 10 | PB2 | D10 | LCD1 | PWM |
| 11 | PB3 | MOSI D11 | LCD2 | PWM |
| 12 | PB4 | MISO D12 | LCD3 | |
| 13 | PB5 | SCK D13 | LCD4 |
n.b: Two pins (PD2 and PD7) are free and could be used to add a fourth sensor.
Power supply
- plug for 5V
- MCP1703-33 for µC power supply
Schematic
Here is the schematic of the main components of the project:
ATMega328P:
List of components
| Type | Value | Quantity | Footprint |
|---|---|---|---|
| Resistor | 1M | 1 | 0805 Handsolder |
| Resistor | 10k | 2 | 0805 Handsolder |
| Resistor | 4.7k | 2 | 0805 Handsolder |
| Resistor | 4.7 | 1 | 0805 Handsolder |
| Potentiometer | 1 | TRIM_3362R-1-222 | |
| Capacitor | 10µF | 2 | 0805 Handsolder |
| Capacitor | 100nF | 3 | 0805 Handsolder |
| Capacitor | 18pF | 2 | 0805 Handsolder |
| Diode Shottky | 3 | D_SOD-123 | |
| BSP75 | 2 | SOT-223-3_TabPin3 | |
| Crystal | 8Mhz | 1 | Crystal_SMD_5032 Handsolder |
| MCP-1703A | 1 | SOT-23 | |
| ATMega328P-AU | 1 | TQFP-32_7x7mm_P0.8mm | |
| 5V power source | 1 | BarrelJack_Horizontal | |
| RJ12 | 1 | RJ12_Amphenol_54601 | |
| LCD Screen | 1 | WC1602A | |
| MHZ-19 (CO2) | 1 | footprints: MHZ-19 | |
| MQ-4 (CH4) | 1 | footprints: MQ-4 | |
| MQ-8 (H2) | 1 | footprints: MQ-8 | |
| DHT22 (Hum) | 1 | footprints: DHT-22_HOR | |
| DS18B20 (Temp) | 1 | TO-92_Inline |
Inspiration for PCB
-
https://github.com/Hackuarium/esp-12e/tree/master/kicad
- ICSP - TAG connect - take care of pin mapping !
- RJ12 - 6P6C
- FTDI232
- LCD: WC1602A
Get inspired from scale board
Parts
37| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | hole | MountingHole:MountingHole_3.2mm_M3 | J3, J4, J5, J6 |
| 3 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C4, C5, C6 |
| 3 | D_Schottky | Diode_SMD:D_SOD-123 | D1, D2, D3 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R3, R5 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C3, C7 |
| 2 | 18pF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C2 |
| 2 | BSP75 | Package_TO_SOT_SMD:SOT-223-3_TabPin3 | Q1, Q2 |
| 1 | 1M | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1 |
| 1 | 4,7 | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2 |
| 1 | 4,7k | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R6 |
| 1 | 4.7k | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R4 |
| 1 | 5V_Power_source | Connector_BarrelJack:BarrelJack_Horizontal | J7 |
| 1 | 8MHz | Crystal:Crystal_SMD_5032-2Pin_5.0x3.2mm_HandSoldering | Y1 |
| 1 | ATmega328P-AU | Package_QFP:TQFP-32_7x7mm_P0.8mm | U2 |
| 1 | Conn FT232RL | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | DHT22 | footprints:DHT22_HOR | U3 |
| 1 | DS18B20 | Package_TO_SOT_THT:TO-92_Inline | U1 |
| 1 | ICSP | Connector:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | SP1 |
| 1 | LOGO | footprints:hackuarium | G1 |
| 1 | MCP1703A-1202_SOT23 | Package_TO_SOT_SMD:SOT-23 | U4 |
| 1 | MH-Z19 | footprints:MH-Z19 | GS3 |
| 1 | MQ-4 | footprints:MQ-4 | GS1 |
| 1 | MQ-8 | footprints:MQ-8 | GS2 |
| 1 | RJ12 | Connector_RJ:RJ12_Amphenol_54601 | J2 |
| 1 | R_POT | TRIM_3362R-1-222:TRIM_3362R-1-222 | RV1 |
| 1 | WC1602A | Display:WC1602A | DS1 |
Questions
How big is the Gas sensor PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Gas sensor use?
37 parts, built around the ATMEGA328P-AU, DHT22, DS18B20 and MQ-4. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Gas sensor KiCad files?
From the Hackuarium/gas-sensor repository on GitHub, at the commit this page was made from: the board is kicad/gas-sensor.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Gas sensor design in my own project?
Its repository states no licence, so its author keeps all rights: ask Hackuarium before reusing the design.
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