Adafruit PiCowBell HSTX DVI Output for Pico

The Adafruit PiCowbell HSTX DVI Output for Pico adds digital video output via a mini HDMI connector, supporting RP2040 and RP2350 boards. It features Qwiic/STEMMA QT I2C, reset and slide switches, USB host pads, and gold-plated breakout pins.

Ding dong! Hear that? It’s the PiCowbell ringing, letting you know that the newAdafruit PiCowbell HSTX DVI Output for Picois in stockand ready todisplay images and graphics from a microcontroller directly to an HDMI monitor or television!Note that it doesn’t do audio, just graphics.

The PiCowbell is the same size and shape as a Pico and is intended to fit underneath to make your next video output project super easy. Mini HDMI connector for use with standard HDMI cables? Yes!STEMMA QT / Qwiic connector for fast I2C? Indeed. Reset button & extra switch for restarting code or changing configuration? Bien sur.

Compared to the original DVI PiCowbell,this board has a very similar setup:

• Uses the HSTX-specific pins for RP2350 usage, that’s GPIO 12-19
• Has a slimmer slide switch
• Adds 4 ‘USB host port’ pads that can be used with PIO-USB to add a peripheral.We recommend a USB-A socket cablefor adding a proper USB host port.

You can use this board witheither a Pico 1 (RP2040, using PIO-DVI) or Pico 2 (RP2350, using PIO-DVI or HSTX-DVI). However, we recommend using thePico 2orPico 2Wwith this board since you can use the improved HSTX peripheral, which means you can save a PIO and processor time when generating video.

In Arduino, we use our fork of PicoDVI (RP2040 or RP235) orAdafruit_DVI_HSTX(RP2350 only) to create an internal framebuffer of 320×240 or 400×240 16-bit pixels that is then continuously blitted out as pixel-doubled 640×480 or 800×480 digital video. Whatever you ‘draw’ to the internal memory framebuffer appears instantly on the digital display in crisp color. Since the library is a subclass of AdafruitGFX, it’ll be familiar to folks who have used our TFT or OLEDdisplays before.

There’s also DVI output support in CircuitPython- but note that it uses alotof memory, so in particular if you want to use Picowith WiFi support, you should go with a Pico 2 since it has more SRAM.

We also connected the HDMI-connectors I2C pins to the SDA/SCL of the Pico (through a safe level shifter) so you can read the EDID EEPROM of displays, and have broken out the CEC and Utility pads. The Hot Plug Detect pin is also available. Read this pin to know when a display has been connected!

Each order comes with an assembled PCBand header. You will need to solder in the header yourself, but it’s a quick task.

Please Note!There are numerous possible configurations, and we stock various headers depending on how you want to solder and attach. Especially if you want the Pico on topso that the BOOTSEL button and LED are accessible.

1. Use the Pico Stacking Headersif you wantto be able toplug into a breadboard or other accessory with sockets.
2. Use the Pico Socket Headers if you want to plug directly in and have a nice, solid connection that doesn’t have any poking-out-bits.
3. Use the Short Socket Headersfor a very slim but pluggable design;note that you’ll want to trim down the Pico’s headers oruse the short plug headers on the Picoto have a skinny sandwich.
4. Solder the PCB directly to the Pico headers – of course, this is very compact and inexpensive, but you won’t be able to remove the PiCowbell.

Features

• Right-angle JST SH connector for I2C / Stemma QT / Qwiic connection.Provides 3V, GND, IO4 (SDA), and IO5 (SCL). Also connected to the HDMI sink (monitor) with level shifting, so the EDID can be read.
• Mini HDMI connectorfor DVI output to any HDMI display or monitor.
  • GPIO12: D0+
  • GPIO13:D0-
  • GPIO14: Clock +
  • GPIO15: Clock –
  • GPIO16: D2+
  • GPIO17: D2-
  • GPIO18: D1+
  • GPIO19: D1-
• Pin breakout for HDMI extras:Utility, CEC,and HotPlug pins
• Reset button– Press to restart your program
• Slide switch– On GPIO #3 for whatever purpose you wish.
• USB host port pads –that can be used with PIO-USB to add a peripheral.We recommend a USB-A socket cablefor adding a proper USB host port.
• Many pads on the ‘Bell have a duplicate hole padnext to it for solder-jumpering
• The ground pads have white silkscreen rectanglesto easily identify
• Gold-plated pads for easy soldering

Resources

• Primary Guide: Adafruit PiCowBell HSTX DVI Output

Specifications

• Product Dimensions: 52.4mm x 20.3mm x 4.9mm
• Product Weight: 4.5g / 0.2oz

Package Contents

• 1x Adafruit PiCowBell HSTX DVI Output for Pico
• 2x 20-Pin Headers