CheapMesh
About the CheapMesh PCB
CheapMesh is an open source PCB design by joyel24, published on GitHub. It is a 2-layer board measuring 34.8 × 67.3 mm, with 22 components from 18 distinct parts.
Other key parts include the L78L33, HT-CT62 and AP2112K-3.3. By type, the board carries 6 resistors, 5 connectors, 4 capacitors, 3 ICs, 2 antennas and 1 transistor.
It belongs with the rf & radio and usb & debug tools designs in this gallery.
From the project
PCB for Heltec HT-CT62: ESP32-C3 + SX1262 lora cheap module. Useful to run MeshTastic. Forked from : https://gitlab.com/paulhausk/CheapMesh
The goal is to get a cheap Meshtastic node with this chip, therefore some corners where cut.
Several componemts are implemented double, just pick what works best for you.
If you want to flash and reflash the HT-CT62 on the pcb, you need to populate R1 and R2. If you not wanna flash the HT-CT62 on the pcb (you have a already programmed chip), you can make a solder bridge on R1.
Main components on the CheapMesh
CheapMesh bill of materials (BOM)
22 components, 18 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | L78L33 | TO-220-3_Vertical | U1 |
| 1 | HT-CT62 | Heltec_HT-CT62 | U2 |
| 1 | AP2112K-3.3 | SOT-23-5 | U3 |
| 1 | UMH3N | SOT-363_SC-70-6 | Q1 |
| 1 | Conn_01x02_Pin | PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_01x09_Pin | PinHeader_1x09_P2.54mm_Vertical | J2 |
| 1 | USB_A | usb-PCB | J3 |
| 1 | USB_C | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J4 |
| 1 | Conn_Coaxial | SMA_Molex_73251-2120_EdgeMount_Horizontal | J5 |
| 1 | Antenna | Texas_SWRA117D_2.4GHz_Left | AE1 |
| 1 | Antenna | Texas_SWRA416_868MHz_915MHz | AE2 |
| 1 | Conn_01x04_Pin | PinHeader_1x04_P2.54mm_Vertical | Screen1 |
| 1 | C_Polarized | CP_Radial_D7.5mm_P2.50mm | C1 |
| 2 | C | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C6 |
| 1 | C_Polarized | CP_Elec_8x6.2 | C5 |
| 2 | 10kΩ | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2 |
| 2 | 22Ω | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R3, R4 |
| 2 | 5.1kΩ | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5, R6 |
CheapMesh design files
The KiCad project lives in the joyel24/CheapMesh repository on GitHub; these links point at the commit this page was built from.
CheapMesh: common questions
How big is the CheapMesh PCB?
The CheapMesh measures 34.8 × 67.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the CheapMesh?
22 components, from 18 distinct parts. The full bill of materials is listed on this page.
Where can I download the CheapMesh design files?
From the joyel24/CheapMesh repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the CheapMesh design in my own project?
The repository has no license, so all rights stay with joyel24. Use it as a reference, and ask the author before reusing the design.
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