Circuit to drive the DHT22 temperature and humidity sensor via the SPI bus.
The advantage is, that it uses next to no CPU resources as everything runs in hardware on most platforms.
This allows a multitaking OS like Linux to reliably read the sensor without issues.
This prototype board expands the GPIO pins of the Raspberry Pi to headers numbered like the software (Wiring Pi) uses this. Made for Educational purposes.
Great advantage is that students make less mistakes in the electronic circuit. When they do make a mistake, debugging is much easyer.
You can also use the prototype board in examples of Fritzing:
The second version of the Cross-board for Raspberry Pi B +, 2, 3.
1. 8 digital inputs with opto-coupler;
2. 8 outputs with solid-state relays;
3. Communication interface RS485;
4. Real-time clock;
5. Conclusions of 1-Ware interfaces (with 3.3 volt power supply), I2C (with 3.3 and 5 volt power supply and matched levels);
6. Terminals for connection of temperature and humidity senso...
This is a Raspberry Pi Zero W hat/shield with USB MIDI input, stereo audio output, 3 user-configurable buttons and OLED display.
To use as an audio card, enable PWM audio output by adding `dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4` at the end of *config.txt* file.
Remeber that HDMI audio output is the default; use `raspi-config` to force output to 3.5mm audio jack.
If you can't find 47uF...
<h1>PiRaTe - The Pi Radio Telescope Board</h1>
<p>Main carrier board for components required for the operation of a DIY RPi-based AzAlt telescope mount which will be utilized to operate a radio telescope.</p>
<li>Accomodates a <a href="https://www.pololu.com/product/2507">Pololu Dual VNH5019 Motor Driver Shield</a></li>
Level Shifter to run 5V NeoPixels (WS1812B) LEDs via a 3.3V SPI bus (e.g. Raspberry Pi).
The P-SPI header was designed in such a way, that the PCB can be plugged on top of the Raspberry without further cabeling.
The P-LED-DRIVE outputs the signal to the LEDs, while P-LED-SENSE _optionally_ connects to the output of the last LED in the chain.
Connecting P-LED-SENSE allows a software running on the...
A board in the raspberry pi zero format to provide a low power usage cellular device for the raspberry pi.
It is intended to be used together with the MuonPi HAT.
A u-blox SARA-G450 - a Quad Band GSM/GPRS module - is used to provide the connectivity features.
In order to stay compatible with the MuonPi HAT, the UART is not used directly, but translated to a USB port instead.
PoE (Power over Ethernet) to USB 5V adapter.
Current use cases:
- Power micro controllers (Arduino's or Pbpi's)
PoE Switch --> **PoE to USB** --power--> Rbpi
Switch ------------Data----------------> Rbpi (There is still a second Ethernet cable needed for data over cable.)
- Charge your Phone or other USB devices
- Trying to support 802.3af
- Add a way to redirect Ethernet d...
Dual MCP23017 + GPIO Daisy-chainable IO expander for Raspberry Pi. Uses swappable daughterboards for flexibility, compatible with the common txs0108e level converter boards. See https://easyeda.com/MadOverlord/io-expander-daughterboard for a MIC2981/Passthrough daughterboard, and https://easyeda.com/MadOverlord/io-expander-voltage-divider-daughterboard for a voltage divider daughterboard (for redu...