CheapMesh is a pcb arround the HT-CT62 chip by Heltec.
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.
WIP
- Option A: use the onboard antennas
- Option B: use an external antenna with the IPEX connector (and cutting of the onboard lora antenna)
- Option C: use an external antenna with an sma connector (and cutting of the onboard lora antenna)
- Option D: solder on a dipol antenna (and cutting of the onboard lora antenna)
- Completele optional. Make sure to get a screen with the matching pinout.
- Option A: use an external 3.3V powersource
- Option C: use a AP211K-3.3 and the correspondending capacitors
- Option B: use a L78L33 and the correspondending capacitors
- Option D: use a L78L33 pin compatible DC/DC Buck converter like this one
- Option A: populate the UMH3N
- Option B: use an external usb serial interface which can reset the chip
- Option C: Connect GND and HT_EN with a wire. Power on the board (by plugging in) and remove the wire.
Never connect more than one powersource at a time!!!
- via the usb a pcb connector
- via the usb c connector
- via the Vin Pins
- via the 3.3V Pins
All Resitors are 1206 SMD Resistors
R1, R2: Pullup Resistors, 10kOhm
R3, R4: USB Inline Resistors, 22Ohm
R5, R6: USB-C Resistors, 5,1kOhm
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.
WIP
- Source the the pcb yourself. I recomend JLCPCB (I not payed nor sponsored by them) to get the pcb created. 5 pcbs should cost 2$ plus shipping and taxes.
- Solder on the components.
- Flash the ESP.
- Option A - use an external usb serial interface
- Option B - use the usb A pcb port
- Option C - use the usb c port
CheapMesh by PaulHausK is licensed under Creative Commons Attribution-ShareAlike 4.0 International
