Modules 1-Channel 5V Relay Module Opto-isolated relay board switching up to 10A at 250VAC or 30VDC from a 3.3V/5V microcontroller pin. Screw ter Contact for price
Modules 4-Channel 5V Relay Module Four independently controlled opto-isolated relays on one board, each rated 10A/250VAC. The usual basis for a Contact for price
Modules 16x2 LCD Display with I2C Classic two-line, sixteen-character character LCD with a PCF8574 I2C backpack, so it needs only SDA and SCL in Contact for price
Modules 0.96" OLED Display (I2C, SSD1306) 128x64 monochrome OLED on an SSD1306 controller, driven over I2C. Self-lit pixels give sharp text and graphics Contact for price
Modules 1.8" TFT SPI Display (ST7735) 128x160 colour TFT on an ST7735 controller over SPI, with a microSD slot on the same board. For projects that Contact for price
Modules RC522 RFID Reader Module 13.56MHz RFID reader/writer using SPI, supplied with a card and keyfob tag. Reads and writes MIFARE Classic. S Contact for price
Modules HC-05 Bluetooth Module Bluetooth 2.0 SPP serial bridge that can act as master or slave, configured with AT commands. Appears as a pla Contact for price
Modules HC-06 Bluetooth Module Slave-only version of the HC-05: pairs with a phone or PC and passes serial data through. Fewer options, less Contact for price
Modules SIM800L GSM/GPRS Module Quad-band GSM/GPRS module for SMS, voice and 2G data over a standard SIM. Needs a supply that can deliver 2A b Contact for price
Modules NEO-6M GPS Module GPS receiver with ceramic patch antenna outputting NMEA sentences over serial, typically 2.5m accuracy with a Contact for price
Modules LoRa SX1278 433MHz Module Long-range spread-spectrum radio reaching kilometres in open ground at very low power, on the 433MHz band over Contact for price
Modules DS3231 Real Time Clock Module Temperature-compensated real time clock accurate to about ±2 minutes per year, with battery backup so time sur Contact for price
Modules nRF24L01+ Wireless Transceiver 2.4GHz transceiver with up to 100m line-of-sight range over SPI, supporting multiple addressable nodes. Popula Contact for price
Modules Micro SD Card Module SPI microSD breakout with a 3.3V regulator and level shifting so it can be driven from 5V boards. Adds file st Contact for price
Modules LM2596 Buck Converter Adjustable step-down regulator taking 4-35V in and giving 1.25-30V out at up to 2A (3A peak), around 90% effic Contact for price
Modules MB102 Breadboard Power Supply Plugs into a breadboard's power rails and supplies selectable 3.3V or 5V on each rail from USB or a 6.5-12V ba Contact for price