MFRC522 is applied to the highly integrated read and write 13.56MHz contactless communication card chip, NXP launched by the company for the “table” application of a low-voltage, low-cost, small size of non-contact card chip, smart meters and portable handheld devices developed better choice. The MFRC522 use of advanced modulation and demodulation concept completely integrated in all types of 13.56MHz passive contactless communication methods and protocols. In addition, support rapid CRYPTO1 encryption algorithm, terminology validation MIFARE products. MFRC522 support MIFARE series of high-speed non-contact communication, two-way data transmission rate up to 424kbit/s.
The PCA9685 is an I2C-bus controlled 16-channel LED controller optimized for LCD Red/Green/Blue/Amber (RGBA) color backlighting applications. Each LED output has its own 12-bit resolution (4096 steps) fixed frequency individual PWM controller that operates at a programmable frequency from a typical of 40 Hz to 1000 Hz with a duty cycle that is adjustable from 0 % to 100 % to allow the LED to be set to a specific brightness value. All outputs are set to the same PWM frequency.
PCA9685 also has a built-in oscillator for the PWM control. However, the frequency used for PWM control in the PCA9685 is adjustable from about 40 Hz to 1000 Hz as compared to the typical 97.6 kHz frequency of the PCA9635. This allows the use of PCA9685 with external power supply controllers. All bits are set at the same frequency. The PCA9685 has 4096 steps (12-bit PWM)
The comprehensive GPIO Pinout guide for the Raspberry Pi.
This GPIO Pinout is designed to be both a quick and interactive reference to the Raspberry Pi GPIO pins, plus a comprehensive guide to your Raspberry Pi’s GPIO interfaces. It also includes dozens of pinouts for Raspberry Pi add-on boards, HATs and pHATs.
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The Raspberry Pi Model A is a cut down version of the Model B, featuring a smaller form factor and only one USB port. The Model A’s do not include ethernet, and are designed to be lower cost, lower power consumption alternative to the Model B.
Model B
The Raspberry Pi Model B is the flagship Raspberry Pi Model, with the fastest CPU and most connectivity features. The latest revision (Raspberry Pi 3 – Model B) features a 1.2GHz Quad Core processor, and on board WiFi & Bluetooth. The Model B is the largest Pi available with the approximate size of a credit card.
Compute
The Compute Module features a 200 Pin DDR2-SODIMM layout, and is designed for engineers who need Raspberry Pi functionality but need a smaller form factor for embedded designs.
Zero
The Raspberry Pi Zero is an ultra low cost and ultra small variant of the Raspberry Pi. It comes with an unpopulated GPIO header, and only a single micro USB port for connectivity. The Raspberry Pi Zero W (Wireless) includes on board WiFi and Bluetooth.
1. 3D print Zero-W top cover
2. 3D print Zero-W base
3. 0.96″128×64 white OLED screen
4. Keypad double x2
5. Button Shaft
6. Keypad single
7. Pi-Zero-W-Net HAT board
8. 11mm spacer x2
9. M2.5 x6mm screw x6
10. M2.5 x10mm screw x2
11. Pi Zero W
12. 16Gb Micro SD card
13. Mini HDMI to HDMi adapter
14. micro USB OTG cable