Shared Projects

For true bypass utilizing relay switching scheme without a micro controller.

Olimex Eval Adapter

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Olimex Board

Olimex Development Board

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Olimex Board

24 bit ADC, TI ADS1274

4 differential input channels (+/- 10V)

Simultaneous sampling on all channels up to 128k

Full schematics, and VHDL source code available here: http://stevenmerrifield.com/datarec.html

Programming Adapter

Designer Josip Medveb

License

Project

More information is available here: https://github.com/mrjacobagilbert/fpv/tree/master/ZMR250_FPV_TX

THIS DESIGN IS OBSOLETE

Please use the v1.2 board here: https://oshpark.com/shared_projects/h9UIDucG

Shield to connect the nRF24L01 to Arduino like boards

Connect nRF24l01 to RaspberryPi

A small four-range USB photodiode amplifier

Weather Station Sensor module v1.1

More background of this project to be found at: https://sourceforge.net/projects/jipshome/

Uses two Boscam RX5808 modules and the diversity controller designed by youtube user RCModelReviews. Includes a switch (SK23D07) that allows direct manual access to the audio/video signals from receivers 1,2 or diversity.

Left position = signal from left antenna, right pos = right antenna, center pos= AV signal as determined by diversity controller.

If you can’t source a switch, simply bridge the upper middle two (video) and lower middle two pins (audio). This will direct the AV output from the diversity circuit to the output

There is another (earlier) version of this board with a LM117 voltage regulator. I have removed it as I have read that it gets far too hot even with 2S. In this case the 22uF 3216 tantalum caps are not needed.

You will need a 5V input (some say that you can go down to 3.3V, but you will have to experiment with that). If you decide to use an external voltage regulator and it has a diode already built in, you might bridge the pads for the diode.

Here is a solution by a german fpv forums member (page 2): http://fpv-community.de/showthread.php?60613-Simples-DIY-2-fach-Diversity-von-screamercx-mit-Modulen-onboard

http://www.ebay.com/itm/3A-DC-DC-Converter-Adjustable-Step-down-Power-Supply-Module-replace-LM2596s-FO-/291353891841?pt=LH_DefaultDomain_2&hash=item43d60b9401

If you need more channels/bands you can open the RX5805 Module and connect BX and S to the corresponding spots on the PCB. Below is the website by der-frickler where he explains how he did it.

http://der-frickler.net/modellbau/fpv/sky-rf

Here is a picture showing where the leads have to be soldered to (Pins 8 and 48, big yellow circles):

http://imgur.com/t3o2cHO

If you f*** up like I did the first time and rip the pads off, you could try soldering the leads directly to the chip (small yellow circles)

Post on rcgroups with more info on the board: http://www.rcgroups.com/forums/showthread.php?t=2127478&page=21#post29336366

*rled = resistor for LED, has to be calculated depending on LED-specifications and voltage input.

Designed for OPA827 and OPA 4227, this circuit amplifies a very small photodiode current input to a +-15V voltage output. OPA827 is chosen to minimize bias current, offset voltage, noise density and price!

This is an update on the original BLF SRK FET driver which was designed by Mattaus, and inspired by the work of Comfychair and several other BLF members.

REQUIRED Parts List (1S Input):

• FET: D2PAK
• RGATE: 0805 - 10 ohm - 50 ohm
• R1: 19.1K (1S input)
• R2: 4.7K
• U1: attiny13a-SSU
• C1: 0805 - 10uF - X5R (or better)
• D1: SOD-323 Schottky Diode

REQUIRED Parts List (2S+ Input):

• FET: D2PAK
• RGATE: 0805 - 10 ohm - 50 ohm
• R1: 36K (2S-3S input)
• R2: 4.7K
• U1: attiny13a-SSU
• C1: 0805 - 10uF - X5R (or better)
• CLDO: 0805 - 10uF - X5R (or better)
• LDO: Many fit - choose on price and availability

OPTIONAL Parts:

• 7135: Optional 7135 for secondary PWM output (Pin 5)
• OTC (for clicky FW use): 0805 - 1uF - X7R
• Ctemp: 0805 Capacitor
• RT1; RT2; T-; T+: Connection points and related component pads for external temperature sensor

Changes from original:

• Additional vias
• Deleted L1 and D1 pads (they were mostly unused)
• Added more LED pads
• Added optional 7135 on secondary PWM channel
• Added optional LDO for 2S+ use
• Changed ADC LVP feed point; now connected directly to input
• No more jumpers or solder bridges needed for switch pads
• SW- and several other low current pads now have thermal relief for easier soldering
• Added optional OTC pad for clicky use
• Added external temperature sensor provisions
• Added gate resistor / pulldown resistor for big FET

Breakout board for four popular motion sensors including the Invensense MPU9250, ST’s LSM9DS0, Maxim Integrated’s MAX21100, and Bosch’s BMX055. Intent is to characterize the performance of the accelerometers, gyros, and magnetometers on these sensors under the same conditions. Separate analog and digital voltage sources to probe effect of digital signal line voltage and noise on data jitter. At least one interrupt broken out per sensor to allow comparison between polling and hardware interrupt on performance. Is there a significant difference between these sensor elements in terms of jitter, drift, stability, and response time? Let’s find out…

Cost: $0.80 for three.

Breakout board for 8-SOIC and 8-MSOP packages. Converts these 8-pin SMD components to breadboard-friendly 0.1-inch pitch by 0.3-inch width through-hole format. Pins numbered on both sides for quick reference.

Break out PCB for Raspberry Pi 2, broken out to the right of the header.

Breakout PCB for Raspberry Pi 2. Broken out to both sides of the header.

About $6.02 per board.