Comparison

FED4 vs FED3 (Quick Comparison)

This page summarizes high‑level differences using the FED4 README and the FED3 specifications/wiki. Where FED4 specs are not published, the table notes “not listed.”

At a glance

Category	FED4	FED3
Core purpose	Feeding experimentation device; integrated environmental monitoring and data logging	Feeding experimentation device
Nose‑pokes	Three	Three (per FED3 wiki)
Pellet dispenser	Updated design; dispensing is greatly improved vs FED3	Legacy FED3 dispenser
Wireless / cloud	Optional Hublink (BLE → gateway → hublink.cloud), auto‑configured via meta.json	Not listed in FED3 specs/wiki
Screen	Sharp Memory Display, 144×168 (from FED4 code)	Sharp Memory Display (FED3 wiki)
Battery	Not listed in FED4 README	3.7 V 4400 mAh (FED3 wiki)
Weight	Not listed in FED4 README	295 g (FED3 wiki)
Dimensions	Not listed in FED4 README	135×85×86 mm (FED3 wiki)
Processor	Not listed in FED4 README	Feather M0 Adalogger (FED3 wiki)

FED4 highlights (from FED4 README)

Area	FED4 highlights
Sensors	BME680 (temp/humidity/pressure/gas), VEML7700 (ambient light), VL53L1X (ToF), STHS34PF80 (motion), DS3231 RTC, plus LIS3DH accel + MLX90393 magnetometer (hardware present; currently unused in default programs)
Outputs	Multicolor nose‑poke LEDs, audio, haptic, SD logging
Wireless	Optional Hublink; enable with fed.useHublink = true and it syncs automatically in run()

FED3 specs (from FED3 wiki)

Spec	FED3
Weight	295 g
Dimensions	135×85×86 mm
Processor	Feather M0 Adalogger
Screen	Sharp Memory Display
Battery	3.7 V 4400 mAh (~7 days continuous)
Pellets	20 mg precision pellets (TestDiet, Bio‑Serv, etc.)

Sources

• FED4 README: https://github.com/KravitzLabDevices/FED4
• FED3 specifications (wiki): https://github.com/KravitzLabDevices/FED3/wiki/FED3-Specifications
• FED3 library: https://github.com/KravitzLabDevices/FED3_library