Photon Pixel Shield

The photon pixel shield is a small board for interfacing between a particle.io photon and some WS2812 based LED strips. Specifically, this board was made to drive Neopixel strips.

Power Requirements - Diode and Fuse Sizing

The board takes in 5V only and is used to power the photon and the pixel strip. Please note that current requirements are mostly driven by the number of LEDs being driven. Each WS2812 LED uses an estimate of 20mA, which can add up quickly.

50 Neopixels: 1A 100 Neopixels: 2A

You will need to pick your own diode and fuse. Since these devices are through hole, physical sizing isn’t as much of a concern for finding the right part - mostly the current/voltage ratings. I found fuses and diodes up to 3A easily fit. Find a Diode with a low forward voltage (less than 0.5V)

Digital Control

The WS2812 based LED strips can be controlled via the photon and the Neopixel library from Adafruit built by technobly. No digital pin is selected by default on the board. Pin D2 is the default in the library. To use the default connect the solder jumper for D2 on the back of the board. Otherwise, you may select almost any digital pin in both software on through the jumper on the board.

BOM

The majority of the BOM, which as of 12-JUL-18, can be found on Mouser.com for around $3.50. You will need to pick a diode and re-settable fuse as noted above.

Power LED

A simple 3mm power LED is required if you wish to have a power indicator. The resistor marked RLED on the board is for the LED. Populate with an appropriate resistor value for the LED chosen. You can use this calculate for sizing the resistor.

Photon Pixel Shield - No Diode Version

The photon pixel shield is a small board for interfacing between a particle.io photon and some WS2812 based LED strips. Specifically, this board was made to drive Neopixel strips.

Power Requirements - Fuse Sizing

The board takes in 5V only and is used to power the photon and the pixel strip. Please note that current requirements are mostly driven by the number of LEDs being driven. Each WS2812 LED uses an estimate of 20mA, which can add up quickly.

50 Neopixels: 1A 100 Neopixels: 2A

You will need to pick your own re-settable fuse. Since this device is through hole, physical sizing isn’t as much of a concern for finding the right part - mostly the current/voltage ratings. I found fuses up to 3A easily fit.

Digital Control

The WS2812 based LED strips can be controlled via the photon and the Neopixel library from Adafruit built by technobly. No digital pin is selected by default on the board. Pin D2 is the default in the library. To use the default connect the solder jumper for D2 on the back of the board. Otherwise, you may select almost any digital pin in both software on through the jumper on the board.

BOM

The majority of the BOM, which as of 12-JUL-18, can be found on Mouser.com for around $3.50. You will need to pick a re-settable fuse as noted above.

Power LED

A simple 3mm power LED is required if you wish to have a power indicator. The resistor marked RLED on the board is for the LED. Populate with an appropriate resistor value for the LED chosen. You can use this calculate for sizing the resistor.

Photon Pixel Shield - No Diode and No Fuse Version

The photon pixel shield is a small board for interfacing between a particle.io photon and some WS2812 based LED strips. Specifically, this board was made to drive Neopixel strips.

Power Requirements

The board takes in 5V only and is used to power the photon and the pixel strip. Please note that current requirements are mostly driven by the number of LEDs being driven. Each WS2812 LED uses an estimate of 20mA, which can add up quickly.

50 Neopixels: 1A 100 Neopixels: 2A

This board version has no fuse or diode, so the only power requirement consideration is your power supply.

Digital Control

The WS2812 based LED strips can be controlled via the photon and the Neopixel library from Adafruit built by technobly. No digital pin is selected by default on the board. Pin D2 is the default in the library. To use the default connect the solder jumper for D2 on the back of the board. Otherwise, you may select almost any digital pin in both software on through the jumper on the board.

BOM

The majority of the BOM, which as of 12-JUL-18, can be found on Mouser.com for around $3.50.

Power LED

A simple 3mm power LED is required if you wish to have a power indicator. The resistor marked RLED on the board is for the LED. Populate with an appropriate resistor value for the LED chosen. You can use this calculate for sizing the resistor.

a basic audio amp using old audio amp chips found in old cd drives

it is a debug board for HP MEDIASMART SERVER

BOM for 3 Boards: https://octopart.com/bom-tool/TR16C2rk

2 layer transmitter

2 layer receiver

4 Channel PMOS high side driver

Two channel high side PMOS driver with NMOS level shifter from 3.3V logic

• R11,21 : 10k
• R12,22 : 3k3 for 25V supply
• R13,23 : 1k
• U1 : IRF7316
• Q1,Q2 : FDN337N

4 Channel PMOS high side driver

Four channel high side PMOS driver with NMOS level shifter from 3.3V logic

• R11,21,31,41 : 10k
• R12,22,32,42 : 3k3 for 25V supply
• R13,23,33,43 : 1k
• U1,U2 : IRF7316
• Q1,Q2,Q3,Q4 : FDN337N

CAN Interface board

Revision: 5

IEEE 1284 parallel port for Raspberry Pi

https://github.com/worlickwerx/pi-parport

Note: there is a newer version available.

Added inrush current limitng

Stanley Meyer Alternator Circuit board Gerber V1 Public Share Mur Diodes 1560 these are to help you advance edit some mounting holes may need movement for your specific conversion this circuit basic rectifies the ac to dc un regulated and blocks back emf

umbrella v0.3

more unicorns for friends