2 Channel Relay Module 5V 10A for Arduino

If you are into prototyping with your Raspberry (which you should be given that is what the board is for), Pimeroni Explorer HAT Pro is a great solution for you. Board is equipped with a range of inputs and outpu, which enables it to achieve range of potential applications from controlling motors, to analog sensors and 5V systems. As any Pimeroni accessory it is well compatible with all Raspberry boards and comes in with a range of Pythong libraries on github issued by Pimeroni team themselves

Pimeroni Unicorn HAT is one of the most popular and at the same time easiest to use Raspberry HATs in Pimoroni offering. It is featured with a matrix of 64 RGB LEDs powered directly through the Pi board. The applications of the HAT spread from just a simple games in the classroom up to color indications in your robot. All of this accessible in a really straight forward way and supported by a range of Python libraries available on github and officially issued by Pimeroni. The hat is compatible with all Raspbery boards given its universal 40 GPIO pinout

This little board is simply a I2C board to Qwiic converter. It pretty much enables any device with I2C connectors to work with Qwiic system. It has two Qwiic ports - both of them served with the same I2C bus. You simply stick the board on your I2C board and get additional two Qwiic ports. It is as easy as it sounds

The 17 x 7 rectangular matrix has a total of 119 white LEDs that can be controlled individually. A dedicated extension to the Raspberry Pi Pico. The device uses the 12C bus for communication and can be safely powered via the USB port.

The Qwiic HAT is an absolute basic of Qwiic system for Raspberry. It enables a quick and efficient connection of an sensor to your Raspberry over I2C bus (GND, 3.3 V, SDA and SCL). As Qwiic enables daisy chaining of components, you can pretty much install as many sensors on the Qwiic HAT as you want. On top of that it fits perfectly Pi Tin enclosure from SparkFun enabling connection while in case.

Sense HAT is your absolute classic used for a well-known and popular Astro Pi projects. It features set of sensors (Pressure, humidity, IMU and temperature) and a great 8x8 LED screen. It is a full set for your Raspberry - you can both measure your projects environment, display it on the screen as well as manouver and input data with joystick and buttons included on the HAT.

The Grove Starter Kit for Arduino is one of the best Arduino starter kits for beginners. It includes an Arduino-compatible base shield and 14 additional Arduino sensors and accessories. With this Grove starter kit, you can create any Arduino project you want.

This HAT is an open source portable sensor that provides the level of suspended particulate matter quantity with its mass. It has a powerful and high-tech PMSA003 sensor that provides the information of suspended particulate matter (PM1.0, PM2.5, PM10) in the air per unit volume.

Edup Mini Dongle WiFi USB For pcDuino 3 Nano Raspberry Pi features:
- Interface type: USB
- Supports IEEE 802.11e draft 802.11n
- Supports USB 2.0, compatible with USB 1.1 and 1.2
- Support systems:
- Win2k / XP / Vista / Win7 / Win8.1 / Win10 / Mac / Linux
- Operating distance: 91 meters indoors, 275 meters in open space
- Transfer rate: 150Mbps (downlink) and 150Mbps (uplink)
- Works with old Wireless-G and Wireless-B networks
- WEP and WPA encryption - 64-bit / 128-bit WEP (Wired Equivalent Privacy), TKIP, AES 2,400GHz ISM
- Frequency range: 2.4 to 2.4835 GHz
- Operating channels: 13 - Support network protocol: CSMA / CA with acknowledgment
- Transmission mode: DSSS

Pimoroni Fan is the best you can do for your new Raspberry 4! It is a well known fact, Raspberries can get hot. Even though, there are plenty of solutions to that, you will find no better than this Pimoroni Fan. It is a no-solder device, hence you can put it on and off as you wish