Compact Handheld Device PCB Design
Budget: $250 – $750 USD
Hi,
I'm looking for an experienced PCB designer to create a custom carrier/breakout PCB for a compact handheld device. No firmware or software needed — design only.
Core Module:
LILYGO TTGO T-Call V1.3 (ESP32 + SIM800L GSM) — mounted on the PCB via pin headers
Components to integrate on PCB:
OLED Display (SSD1306 128x64, I2C, 4-pin):
Mounted above the PCB using standoff spacers — 4 mounting holes required
Height will be adjusted with standoffs
4-wire cable from display soldered directly to PCB pads
Buttons:
1x membrane switch connector (2-pin) for main button
2x additional button footprints connected to spare GPIO pins (for future use)
Buzzer:
Passive buzzer mounted directly on PCB
Connected to designated GPIO via NPN transistor + flyback diode driver circuit (active HIGH trigger)
RDM6300 RFID Reader:
Properly mounted on PCB
External antenna connected via PCB-mounted jack/connector
Signal traces should be impedance-matched and isolated from noisy traces (power, GSM) to prevent signal degradation
USB Type-C Port:
Dedicated USB Type-C female connector on PCB, wired to the dev board's USB lines
Should protrude ~2mm from PCB edge for easy access through enclosure
This replaces the onboard Micro-USB which is difficult to route through a case
Battery:
LiPo battery connector on PCB if feasible (JST-PH 2.0 or similar)
If not practical, battery can connect directly to the dev board — not a blocker
RTC Module (Optional but preferred):
If spare GPIO pins are available, add an RTC chip (e.g., DS3231) with required passives (crystal, decoupling caps) directly on the PCB
Connected to I2C bus (shared with OLED)
Design Requirements:
Compact handheld form factor (~100×60mm or smaller)
All components mounted on PCB — no flying wires
Proper grounding and trace isolation, especially around RFID antenna connector and GSM module
Gerber files + BOM + pick-and-place files ready for JLCPCB / PCBWay
STEP file export for 3D enclosure design
Clear silkscreen labels for all connectors, pins, and polarity markings
What I'll provide:
Complete GPIO pin assignment documentation
Component datasheets and module dimensions
Reference photos of the current prototype
Scope: PCB design only — no firmware/software required.
Please share your portfolio and a rough quote.
I'm looking for an experienced PCB designer to create a custom carrier/breakout PCB for a compact handheld device. No firmware or software needed — design only.
Core Module:
LILYGO TTGO T-Call V1.3 (ESP32 + SIM800L GSM) — mounted on the PCB via pin headers
Components to integrate on PCB:
OLED Display (SSD1306 128x64, I2C, 4-pin):
Mounted above the PCB using standoff spacers — 4 mounting holes required
Height will be adjusted with standoffs
4-wire cable from display soldered directly to PCB pads
Buttons:
1x membrane switch connector (2-pin) for main button
2x additional button footprints connected to spare GPIO pins (for future use)
Buzzer:
Passive buzzer mounted directly on PCB
Connected to designated GPIO via NPN transistor + flyback diode driver circuit (active HIGH trigger)
RDM6300 RFID Reader:
Properly mounted on PCB
External antenna connected via PCB-mounted jack/connector
Signal traces should be impedance-matched and isolated from noisy traces (power, GSM) to prevent signal degradation
USB Type-C Port:
Dedicated USB Type-C female connector on PCB, wired to the dev board's USB lines
Should protrude ~2mm from PCB edge for easy access through enclosure
This replaces the onboard Micro-USB which is difficult to route through a case
Battery:
LiPo battery connector on PCB if feasible (JST-PH 2.0 or similar)
If not practical, battery can connect directly to the dev board — not a blocker
RTC Module (Optional but preferred):
If spare GPIO pins are available, add an RTC chip (e.g., DS3231) with required passives (crystal, decoupling caps) directly on the PCB
Connected to I2C bus (shared with OLED)
Design Requirements:
Compact handheld form factor (~100×60mm or smaller)
All components mounted on PCB — no flying wires
Proper grounding and trace isolation, especially around RFID antenna connector and GSM module
Gerber files + BOM + pick-and-place files ready for JLCPCB / PCBWay
STEP file export for 3D enclosure design
Clear silkscreen labels for all connectors, pins, and polarity markings
What I'll provide:
Complete GPIO pin assignment documentation
Component datasheets and module dimensions
Reference photos of the current prototype
Scope: PCB design only — no firmware/software required.
Please share your portfolio and a rough quote.