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This flexible 4x4 matrix keypad is connected to an 8 pin DuPont Female connector. It can be attached to a surface via the adhesive back by removing the white protective paper backing.
Specifications:- Contact Resistance: 10Ω-500Ω
- Insulation Resistance: 100MΩ 100V
- Key Operating Force: 150-200N
- Circuit Rating: 35V DC, 100mA, 1W
- Dielectric Strength: 250V RMS (50-60HZ/Min)
- Electric Shock Jitter: ï¼ÂÂÂ5ms
- Operating Temperature: -40 deg. C ~ 80 deg. C
- Storage Temperature: -40 deg. C ~ 80 deg. C
- Vibration: 20G, max
- Size: 68mm x 76mm
- 1 x 4x 4 Matrix Array Membrane Keypad
Looking for easy to control LED matrix? This 4 in 1 Dot Matrix Display module should be suitable for you. The whole module comes in four 8x8 RED common cathode dot matrix that equiped with MAX7219 IC each. Great to display running text and picture. It can be cascaded to bigger dot Matrix display, but do make sure the current of 5V is sufficient to support it.
Specifications:
A single module can drive a 8x8 dot matrix common cathode
Working voltage: 5V
Module size: 12.8 x 3.2 x 1.3 cm (L*W*H)
With 64 fixing screw holes, hole diameter: 3mm
Module with input and output interfaces, support for cascading multiple modules
Wiring:
1. The left side of the module is the input port, and the right is the output port.
2. Control of a single module, the input port only need to receive CPU.
3. The more a module cascade and input end of the first module is connected with the CPU and input end of the input end of the output end is connected to the second module, output terminal of the second module connected with the three modules, and so on.
For example: 51 SCM
VCC→5V
GND→GND
DIN→P2.2
CS →P2.1
CLK→P2.0
Package includes:
1 x MAX7219 Dot Matrix Module
1 x 5pin jumper Cable
Documentation:
https://max7219.readthedocs.io/en/0.2.3/
Clock example
Python Library
Description:
The MAX7219 are compact, serial input/output common-cathode display drivers that interface microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Only one external resistor is required to set the segment current for all LEDs. 
Specifications:
1 single module can drive an 8 * 8 dot matrix common cathode
Module Operating voltage: 5 v
Module dimensions: length 32 mm X 32 mm wide X 13 mm high
4 mounting holes : diameter of 3 mm
Support for cascading multiple modules
Wiring instructions:
VCC: 5 v
GND: GND
DIN: P2.2
CS: P2.1
CLK: P2.0
1 x LED module (Red)
A whole heap of LED pixels with individual brightness control, for scrolling messages, animations, and more - Scroll pHAT HD!
Scroll pHAT HD packs 17x7 pixels (119 total) onto a single pHAT, and gives you full PWM brightness control over each pixel. Create beautiful animations and even anti-aliased text by taking advantage of the per-pixel brightness.
Now also available in beautiful coloured versions: red, orange, yellow, green, blue, and pink!
Use Scroll pHAT HD as a scrolling message display for your tweets, the weather or the news, or use it as a 17-band spectrum analyser for your audio. There's even enough pixels for simple games like Tetris, Pong, or snake.
Features
- 17x7 matrix of bright white, or coloured, pixels (119 total)
- Individual PWM brightness control of each pixel
- Uses the IS31FL3731 LED matrix driver chip
- Scroll pHAT HD pinout
- Compatible with Raspberry Pi 3B , 3, 2, B , A , Zero, and Zero W
- Python library
- Female header requires soldering
Software
Our handy one-line installer will install the Scroll pHAT HD Python library for you. We've included a bunch of examples too, to show off what you can do with Scroll pHAT HD.
Our software does not support Raspbian Wheezy.
Overview of matrix membrane and Raspberry Pi
The HT16K33 is a memory mapping and multi-function LED controller driver. The max. Display segment numbers in the device is 128 patterns (16 segments and 8 commons) with a 13*3 (MAX.) matrix key scan circuit. The software configuration features of the HT16K33 makes it suitable for multiple LED applications including LED modules and display subsystems. The HT16K33 is compatible with most microcontrollers and communicates via a two-line bidirectional I2C-bus.
Features:
Operating voltage: 4.5V~5.5V.
Integrated RC oscillator.
I2C-bus interface.
16*8 bits RAM for display data storage.
Max. 16 x 8 patterns, 16 segments and 8 commons.
R/W address auto increment.
Max. 13 x 3 matrix key scanning.
16-step dimming circuit.
Selection of 20/24/28-pin SOP package types.
Applications:
Industrial control indicators.
Digital clocks, thermometers, counters, multi meters.
Combo sets.
VCR sets.
Instrumentation readouts.
Other consumer applications.
LED Displays.
Package included:
1 x Module
Getting Started
Description:
The MAX7219 are compact, serial input/output common-cathode display drivers that interface microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Only one external resistor is required to set the segment current for all LEDs.
Specifications:
1 single module can drive an 8 * 8 dot matrix common cathode
Module Operating voltage: 5 v
Module dimensions: length 32 mm X 32 mm wide X 13 mm high
4 mounting holes : diameter of 3 mm
Support for cascading multiple modules
Wiring instructions:
VCC: 5 v
GND: GND
DIN: P2.2
CS: P2.1
CLK: P2.0
1 x LED module (Green)
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