Shared Projects

L298N Breakout with Flyback Diodes

Detects Metal via an LC Tank Circuit and a Comparator

Breakout for ESP-01 WiFi Module (w/reset button)

PDB for quads. Includes 5V@2A BEC and current sensor for 70A/3.3V or 120A/5V sensor inputs

AgOpenGPS Boom Relay Controller V1.0

Quadcopter F7 flight controller

PCB in surface mount of the Pinguino board based on the microcontroller PIC18F2550.

UNTESTED board to merge a 2.8 tft and a pi zero, with access to the gpio

Description

The Atari SIO port runs at a 5V logic level. This board does down level shifting for connecting the Atari Data-In, Data-Out and Command lines to a microcontroller, Raspberry Pi or other device using logic levels less than 5V.

The board fits like an edge connector in between the two rows of pins in the Atari SIO port and is modeled after the Atari8Warez “Poor Mans SIO Cable”. The side labeled “SIO23V3” is the top/up side.

OSHPark boards are only 1.6mm thick which requires adding solder to the Atari SIO pads so they make contact with the pins. I don’t know exactly how much is needed, but it took several tries of adding more to get it just right.

So far, I have tested this board on my Atari 400 connected to an ESP-01 (esp8266, 3.3V). The Atari 400 5V output was able to keep the ESP-01 powered (thru a 3.3V voltage regulator) and connected to a bbs via telnet over Wifi using this modem emulator code.

Part List

• D1: LL4150GS18 (or comparable)
• Q1-3: DMG2302U (or comparable)
• R1-R6: 10K 0603 5%
• 6 pin 0.1"/2.54mm Header (or directly soldered wires)

Pin Description

• GND: Ground
• CMD: Atari SIO Command Pin (level shifted)
• DATOUT: Atari SIO Data Out (to device RX, level shifted)
• DATIN: Atari SIO Data In (to device TX, level shifted)
• 3V3IN: Low voltage input (device logic level)
• 5VOUT: Atari 5V/Ready Output (can be used to as supply for low power microcontroller, current limit unknown)

Test Points/Pads

The remaining pins on the Atari SIO port are routed to test point pads on the board for experimenation. Keep in mind, these pads are directly connected to the Atari (no level shifting).

• CKIN: Clock In
• CKOUT: Clock Out
• MCTL: Motor Control
• AIN: Audio In
• GND: Ground
• 12V: +12V (Atari 400/800 only)
• INT: Interrupt
• PCD: Proceed

Arduino Shield

NOT FOR PRODUCTION - Minor changes must still be made

Powerlolu Pololu <-link to source

2 layer board of 0.80x0.62 inches (20.22x15.82mm). $2.45 for three.

High Power Pololu Board (Powerlolu) based on A4989 - can be connected to RAMPS Pololu port

Description

Powerlolu can drive stepper motors up to 500 Watts, drawing currents up to 10 Amps. The existing Pololu boards found in common RepRap 3D printers are at their limits when driving the 2 Nema17 z-axis stepper motors in parallel.

Continuous z-axis movement can cause the board to overheat. These boards hardly drive stepper motors bigger than a Nema17. To avoid overheating or to drive larger motors a more powerful driver board is needed.

The Powerlolu board enables the use of bigger stepper motors for a wide range of uses. This could be the conversion of manual milling machines into computer controlled milling machines (CNC-Machines) using the affordable electronics such as Arduino and RAMPS. Building 3D printers with a larger print volume or with larger extruders would be possible.

Tested the design by connecting a Nema43 stepper motor by Nanotec Electronic (capable of 6.6 Amps per coil, Torque 2000Ncm, Weight 8,4kg) to a Powerlolu attached to a 3D printer’s RAMPS X-port.

A short video of the new driver can be seen on YouTube at https://www.youtube.com/watch?v=G9FWvhZI7rs .

After two hours of motor usage the Powerlolu board only got luke warm - however see Installation Note

The schematics for the Powerlolu driver are freely available at https://github.com/fluidfred/powerlolu.

Technical specifications:

3-wire control with DIR, STEP, Enable-signal, compatible to the Pololu board
Supply voltage of the stepper motor from 12V to 50V
Adjustable stepping via SMD-jumper, 1, 1/2, 1/4, 1/16 (default) steps
Precision pot to adjust the current limiter
no extra heat sink required due to passive cooling up to NEMA 23 stepper motors.
Molex snap-on connector for connecting the RAMPS board to the Powerlolu
Dimensions PCB: 75.5mm x 65mm

Important installation note:

Observe the heat emission when using stepper motors larger than NEMA 23. If necessary, implement a cooling system, i.e. heat sinks mounted at the power-Mosfets and a fan. Each individual Powerlolu should be protected by connecting an appropriate fuse between VBB (X2) and the power source of the stepper motor.

More installation notes can be found under http://wiki.germanreprap.com/en/handbuch/powerlolu concerning wiring with RAMPS and current limiter adjustment.

Powerlolu <-link to source

2 layer board of 2.55x2.97 inches (64.77x75.51mm). $37.90 for three

High Power Pololu Board (Powerlolu) based on A4989 - can be connected to RAMPS Pololu port

Description

Powerlolu can drive stepper motors up to 500 Watts, drawing currents up to 10 Amps. The existing Pololu boards found in common RepRap 3D printers are at their limits when driving the 2 Nema17 z-axis stepper motors in parallel.

Continuous z-axis movement can cause the board to overheat. These boards hardly drive stepper motors bigger than a Nema17. To avoid overheating or to drive larger motors a more powerful driver board is needed.

The Powerlolu board enables the use of bigger stepper motors for a wide range of uses. This could be the conversion of manual milling machines into computer controlled milling machines (CNC-Machines) using the affordable electronics such as Arduino and RAMPS. Building 3D printers with a larger print volume or with larger extruders would be possible.

Tested the design by connecting a Nema43 stepper motor by Nanotec Electronic (capable of 6.6 Amps per coil, Torque 2000Ncm, Weight 8,4kg) to a Powerlolu attached to a 3D printer’s RAMPS X-port.

A short video of the new driver can be seen on YouTube at https://www.youtube.com/watch?v=G9FWvhZI7rs .

After two hours of motor usage the Powerlolu board only got luke warm - however see Installation Note

The schematics for the Powerlolu driver are freely available at https://github.com/fluidfred/powerlolu.

Technical specifications:

3-wire control with DIR, STEP, Enable-signal, compatible to the Pololu board
Supply voltage of the stepper motor from 12V to 50V
Adjustable stepping via SMD-jumper, 1, 1/2, 1/4, 1/16 (default) steps
Precision pot to adjust the current limiter
no extra heat sink required due to passive cooling up to NEMA 23 stepper motors.
Molex snap-on connector for connecting the RAMPS board to the Powerlolu
Dimensions PCB: 75.5mm x 65mm

Important installation note:

Observe the heat emission when using stepper motors larger than NEMA 23. If necessary, implement a cooling system, i.e. heat sinks mounted at the power-Mosfets and a fan. Each individual Powerlolu should be protected by connecting an appropriate fuse between VBB (X2) and the power source of the stepper motor.

More installation notes can be found under http://wiki.germanreprap.com/en/handbuch/powerlolu concerning wiring with RAMPS and current limiter adjustment.

A Simple grbl to Gecko G540 breakout board. For more information please see my github or website.

For a more feature rich grbl Gecko G540 USB Controller see my new controller at Website

Source Files are provided on my Github

Control panel for the preamp with switched pad

Includes BLDC fan detection

NOTE There is a error with the I2C pull-up disconnect in version 012 of the board. Please use version 015, which is also shared.**

This is a LEGO Minifigure sized development board using an Atmel SAMD21E 32-Bit ARM chip. I basically followed the recommended layout/setup from the SAMD21 spec sheets.

Included on Mini SAM is a WS2812B LED pad connected to PIN 27, a 0603 LED connected to PIN 15, a reset button with support components per the datasheet, and a generic button that is active HIGH on PIN 28. The 0603 LED is connected in series with a 1Kohm resistor, part of R1, and care should be taken when selecting an 0603 LED such that at a supply of 3.3V, no more than 5mA is required.

Programming port is a standard10-pin SWD for ARM based processors, which is a 2x5 1.27mm pitch connector. The SWD line is pulled up with a 1Kohm resistor, part of R1. In the BOM, either purchase the 2x5 straight pin connector OR the 2x5 POGO connector and do not populate board.

The SDA/SCL pins are pulled high with 4.7KOhm resistors, R2, per SDA/SCL recommendations.

The voltage regulator is an AP2112K-3.3V which is rated at 600mA at 3.3V. Plenty of current for the SAMD21E and a few other accessories such as the WS2812B.

This version has SMT layout for two single row 2.54mm pitch headers on the back. It is designed to be protoboard friendly and when populated the headers are the same width as a DIL package (7.62mm or .3") and span the center of a protoboard.

PINs 27 and 28 are not connected to headers - due to lack of space - but instead have two pads near the bottom of the board. PIN 27 is connected to the on-board WS2812B. PIN 28 is connected to the on-board BUTTON.

The Analog Reference (PIN AREF) - has a pair of decoupling/filtering capacitors.

The micro-USB connector has an RC filter between the case/shield of the connector and GND. If R6 and C13 are left un-populated the case/shield is an open circuit - which is the next best option. Also included is space for a PRTR5V0U2X ESD protection circuit on USB Data lines. This may also be left un-populated and USB will function normally.

I have put together a sample BOM via Mouser.com which I’m including here. It can be used as a reference. Optional, but highly recommended components: SW2812B 3535 LED, 0603 LED, SW2 (BUTTON), R4, R5, R6, C13, and PRTR5V0U2X. R1 is for the 0603 LED and SWCLK - If not populating the 0603 LED this may be left un-populated as well and programming via SWD should still work as I’ve seen other boards without the 1Kohm resistor on SWCLK. R2 is the 4.7Kohm pull-up resistor pair for SDA/SCL. Many breakout boards using chips that run off SDA/SCL typically come with the 4.7Kohm pull-up resistor pair included - as such it may not be needed on Mini SAM - but it is included for ease of future components. Please review the schematic for additional details and be aware that the BOM on Mouser.com may be out of date. The SW2812B is not in the Mouser BOM - due to lack of parts.

Mouser BOM

I would suggest not purchasing the 2.54mm pitch SMT male headers from Mouser, as you can find this much cheaper elsewhere. The best I could find on Mouser is (2) 5-Pin and (2) 6-Pin headers. Mini SAM requires (2) 11-PIN headers. I suggest buying breakaway headers in 25-50 PIN lengths.

Arduino FIRMWARE/BOOTLOADER is complete, but I’m still testing all functions. So far all PINs work in digital setup and all analog PINs work accordingly. ANALOG and special function pins (MOSI, SDA, SCK, etc) can be accessed in Arduino by their name.

Please check my Github for the latest design files and bootloade/firmware.

More details can be found on Github

Improvements:

• Better wire routing

• Slimmer USB stack side.