t3ry4git/stm32Co2A simple CO2 and environmental monitor based on the STM32F103C8 microcontroller. The firmware reads temperature and humidity from a DHT22 sensor, measures CO2 concentration using an MHZ19B module and displays values on…
Diploma is an open-source printed circuit board by t3ry4git, from the t3ry4git/stm32Co2 repository on GitHub. It is a 2-layer board of 100 × 100.1 mm with 62 parts on 86 nets, routed with 570 tracks and 38 vias.
It is built around the STM32F103C8T6, MH-Z19B and DHT22, with the MT3608, AP2112K-3.3 and DW01A among its other parts. Its parts include 19 capacitors, 15 resistors, 7 ICs, 6 diodes and 3 connectors. It belongs with the STM32 boards of this library.
A simple CO2 and environmental monitor based on the STM32F103C8 microcontroller. The firmware reads temperature and humidity from a DHT22 sensor, measures CO2 concentration using an MHZ19B module and displays values on an SSD1306 OLED screen.
test.ioc project file in STM32CubeIDE.test target from the IDE. Default settings produce both Debug and Release outputs.This repository includes STM32 HAL drivers from STMicroelectronics under the BSD‑3‑Clause license as found in Drivers/STM32F1xx_HAL_Driver/LICENSE.txt. The SSD1306 display driver and font code in Core/Src and Core/Inc are distributed under the GNU GPL version 3.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100 nF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C5, C7, C10, C11, C12, C13, C15, C20 |
| 5 | 10 uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C2, C4, C8, C9, C14 |
| 3 | 10 k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R8, R16 |
| 3 | 100 k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R9, R10 |
| 3 | GREEN | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D2, D4, D5 |
| 2 | 100 pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C16, C17 |
| 2 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12, R15 |
| 2 | 1043 | Battery:BatteryHolder_MPD_BH-18650-PC2 | BT1, BT2 |
| 2 | 12 pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C18, C19 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R5 |
| 2 | 510 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13, R14 |
| 2 | SS34 | Diode_SMD:D_SMA | D3, D6 |
| 1 | 1 M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 1 nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1 |
| 1 | 1.2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 2.2 k | Potentiometer_SMD:Potentiometer_Bourns_3214X_Vertical | RV1 |
| 1 | 22 uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C6 |
| 1 | 22uH/2A | Inductor_THT:L_Radial_D7.5mm_P3.50mm_Fastron_07P | L1 |
| 1 | 32768Hz | Crystal:Crystal_SMD_Abracon_ABM3-2Pin_5.0x3.2mm | Y2 |
| 1 | 5.1 k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11 |
| 1 | 8MHz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | Boot0 | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm_NumberLabels | JP1 |
| 1 | Boot1 | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm_NumberLabels | JP2 |
| 1 | Calibrate | Button_Switch_THT:SW_PUSH_6mm | SW2 |
| 1 | DHT22 | Sensor:ASAIR_AM2302_P2.54mm_Vertical | U6 |
| 1 | DW01A | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | Enable Switch | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | FS8205A | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | Q1 |
| 1 | Flash | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J2 |
| 1 | MH-Z19B | Sensor:MH-Z19B | U7 |
| 1 | MT3608 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | OLED_LCD | MountingEquipment:TE_1734598-4 | J1 |
| 1 | RED | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | Reset | Button_Switch_THT:SW_PUSH_6mm | SW3 |
| 1 | STM32F103C8T6 | Package_QFP:LQFP-48_7x7mm_P0.5mm | U5 |
| 1 | TP4056 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm_ThermalVias | U1 |
| 1 | USBC | Connector:usbc | P1 |
It measures 100 × 100.1 mm and has 2 copper layers, 1.6 mm thick.
62 parts, built around the STM32F103C8T6, MH-Z19B, DHT22 and MT3608. 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.
From the t3ry4git/stm32Co2 repository on GitHub, at the commit this page was made from: the board is GRAPH/Terentiev_I_D_draw_KiCAD/diploma.kicad_pcb and its schematic GRAPH/Terentiev_I_D_draw_KiCAD/diploma.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask t3ry4git before reusing the design.
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