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temperature and humidity sensor node
It should be a low-power environmental node with a digital T/RH sensor, ultra-low-power MCU
portable speaker/boombox (stereo Class-D)
It should be a compact stereo system with dual Class-D amps (2×10–25 W class), simple DSP/EQ or MCU tone controls
handheld digital thermometer & data logger (K-type/NTC)
It should be a handheld meter with a thermocouple ADC + cold-junction compensation, a secondary NTC channel, low-power MCU with RTC for timestamped logging, microSD for CSV export
compact (FOC) brushless DC motor driver board
The key subsystems are: power stage and gate drive, sensing, MCU, comms, and protection to thermal/mechanical stress; external loads: motors dominate (8W to 12W)
1S Li-ion power module (charger + protection + fuel gauge)
It should be a single-cell power delivery board with a charger + power-path, pack protection FETs (OV/UV/OC/short), fuel gauge with sense resistor and alert pin, thermistor input
constant-current LED buck driver (non-isolated, dimmable)
It should be a CC LED buck, PWM/analog dimming with soft-start and fault flagging, LED voltage monitor
Wifi and Bluetooth
Wi-Fi + Bluetooth (dual-radio) — 2.4 GHz 802.11 b/g/n plus BLE 5.x
WiFi
Wi-Fi — 2.4 GHz 802.11 b/g/n (optionally 5 GHz), secure OTA
Bluetooth Low Energy
Bluetooth Low Energy — BLE 5.x (1M/2M/Coded), with (UART-over-BLE, DFU), and OTA DFU
USB-C (data)
USB-C (data) — USB 2.0 FS/HS device with proper CC configuration, ESD protection; supports console/logging and firmware updates
USB to UART
USB-to-UART — Driverless CDC bridge with level-shifting, and activity LEDs optional
PWM/analog dim input
PWM / Analog dim input — Accepts PWM and/or analog dim with de-glitch/RC filtering, selectable polarity
CAN
CAN (Classical/FD) — ISO-11898 transceiver (optionally isolated), and support for higher-level protocols as needed
I2C
I²C — Multi-drop 100 k/400 k/1 MHz bus with correctly sized pull-ups, level-shifting as needed
SPI
SPI — Mode 0/3 synchronous bus with multi-CS, optional CRC/framing and DMA; short
LoRaWan
LoRaWAN — Sub-GHz radio with OTAA/ABP, ADR, secure key storage, and airtime-aware scheduling.
Zigbee
Zigbee — 2.4 GHz 802.15.4 with Zigbee 3.0 stack, and OTA updates.
USB-C (5V)
USB-C (5 V) — USB-C receptacle 5 V default; include reverse/OVP/UVLO/OCP protection and plan for 0.5–3 A sources
USB-C (PD 12V)
USB-C PD (12 V) — PD controller negotiates 12 V PDO, hot-swap/inrush limiting on VBUS, and standard OVP/UVLO/OCP; supports tens of watts
5 VDC barrel jack
5 V DC barrel jack — Fused/TVS-protected 5 V input add transient clamps and basic EMI care at higher loads
12 VDC barrel jack
12 V DC barrel jack — Fused/TVS-protected 12 V input add transient clamps and basic EMI care at higher loads
24 VDC barrel jack
24 V DC barrel jack — Fused/TVS-protected 12 V input add transient clamps and basic EMI care at higher loads—observe creepage/clearance
solar
Solar — PV panel through blocking/ideal-diode into, to system rails
single-cell Li-ion/LiPo battery
Single-cell Li-ion/LiPo (1S) — On-board 1S charger with power-path and NTC, pack protection (OV/UV/OC/short), and simple fuel-gauge; prioritize low-IQ for long standby
multi-cell Li-ion/LiPo battery
Multi-cell Li-ion/LiPo (nS) — Multi-cell charger/BMS with balancing, direct high-power path where appropriate; monitor pack V/I and thermals
2x AA batteries
2×AA batteries — Primary (alkaline/Li-FeS₂) or NiMH cells with UVLO and reverse-polarity guard