Source: ReTerminal Kit — Connected Objects
reTerminal
Development board based on Raspberry Pi Compute Module 4 (CM4) by Seeed Studio.
Key Specs
- CPU/RAM: CM4 — 4 GB RAM, 32 GB eMMC storage
- Display: 5” IPS capacitive multi-touch, 1280×720 px, 293 PPI
- Wireless: Dual-band 2.4 GHz / 5 GHz Wi-Fi + Bluetooth 5.0 BLE
- Networking: Gigabit Ethernet, 2× USB 2.0 Type-A
- GPIO: 40-pin header
- Built-in: accelerometer, light sensor, RTC, cryptographic co-processor
- Power requirement: minimum 3 Amps (official Raspberry Pi USB-C power supply)
Grove Base Hat for Raspberry Pi
Add-on HAT for the 40-pin GPIO header. Provides Grove connector types:
| Type | Count | Notes |
|---|---|---|
| Digital | 6 | Digital I/O |
| Analog | 4 | 12-bit ADC (0–4095) — Pi has NO native ADC |
| I2C | 3 | Two-wire bus |
| PWM | 1 | Pulse-width modulation |
| UART | 1 | Serial |
Critical: The Pi has no built-in ADC. The Grove Base Hat provides 4 analog (ADC) channels at 12-bit resolution.
Sensors in Kit
AHT20 — I2C Temperature & Humidity Sensor
- Protocol: I2C
- Temperature range: -40°C to 85°C
- Humidity range: 0–100% RH
- Digital output via Grove I2C connector
Actuators in Kit
| Actuator | Description |
|---|---|
| LED Socket | LED + potentiometer for brightness, swappable color |
| Cooling Fan | 5V, 40mm×10mm, 2-pin JST connector |
| Relay | Digital switch — controls on/off flow of electricity |
Cables
- Grove Universal 4-pin (5 cm and 20 cm variants)
- Grove 4-pin to Female Jumper wires
- Grove 4-pin to Male Jumper wires
- 40-pin flat ribbon cable (20 cm, female-female)
- 2-pin JST SM plug
See Also
- GPIO and reTerminal topic
- Serial Protocols topic (for I2C)