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Raspberry Pi 3: Wire It Directly From The Power Supply

In order to avoid power related issues with any of the Raspberry Pi 3 model, it is recommended to just directly power it from your power supply (PowerBoost 1000c, GearBest PowerBoost, etc.).

So here’s how you would power your Pi 3 which is the same for all the models (Model B, Model B+, Model A+). The PP2 pad goes to the 5V+ output of your Power Supply and the PP5 pad goes to the GND output of your Power Supply. Use a wire that’s 24-26awg in size.

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tinkerBOY PowerSwitch v1.0 Prototype #2 and Add-On Boards

With the issues on the prototype #1 I revised the PowerSwitch and included a microusb port for charging. My initial testing is looking good on both the boost and charging part.

The add-on boards are for the volume wheel and usb female port. One with builtin tactile buttons and the other without it for those who prefer other back buttons.

I will be testing them and will post update.

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RetroPie Image with Built-in Support for USB Audio, GPIO Controller Inputs, and DPI

I have tested these RetroPie images myself and included all the necessary software and settings.

Download and extract the compressed file using 7-zip.

These images should work with the tinkerBOY Controller v3.0 without changing anything.

In order to use the Adafruit Retrogame program for the GPIO controller inputs with the tinkerBOY Controller v2.0.1, v1.1, or v.1.2 you just need to uncomment the line # /usr/local/bin/retrogame & from /etc/rc.local and edit the file at /boot/retrograme.cfg to match your GPIO configuration.

The tinkerBOY DPI Adapter v1.0 also works with these images out of the box.

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tinkerBOY PowerSwitch v1.0 Prototype #1

Got my pcb orders yesterday and was very excited to assemble one. Unfortunately it didn’t work on my first test. It’s abnormally consuming too much power around 1A without even a load on it and the output voltage is way below 5v. 🙁 I went to view the schematics again and found out that I connected some of the components wrong. So I tried cutting some traces and re-routed some of the components. I re-tested it again and this time the output voltage is 5.2v and consumption without load is just what I expected. It works! 🙂

Well, not really. Haha..😂 I read somewhere before that it’s very important to use short and wide traces for high switching boost converter but obviously I forgot to consider that with the design of my PowerSwitch. Eugene also mentioned something about this on my Facebook page. This is probably the reason why i’m hearing a high-pitched squealing noise when powering a Pi 3. What do you think?

 

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5V Boost + Battery Charger + Safe Shutdown = tinkerBOY PowerSwitch

I’m currently working on a power board for Game Boy Zero which I will be calling the tinkerBOY PowerSwitch. It’s supposed to be a builtin upgrade for my tinkerBOY Controller v3.0 but I decided to design it separately and integrate a slide switch. This way, it’s not limited to just my v3 but can be used by anyone using any controller board as well as my other controllers like the v1.1, v1.2, v2.0.

The 3 most important features will be 5V boost, battery charger, and a safe shutdown feature. I’m almost done with the design and I will be ordering some PBCs soon so I can test it. So don’t forget to subscribe to my facebook page at https://www.facebook.com/tinkerBOY/ for updates.

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How To Setup Putty To Automatically Login To Your Raspberry Pi

I’m always looking for ways to save time so here’s how you can setup putty to automatically login to your Raspberry Pi.

Let’s Get Started

  1. Go to the folder where you installed putty.exe, left click on it to select it, right click on it and choose “Create shortcut”. 
  2. Select the newly created shortcut file, right click on it and select “Properties”. In the “Target” text field, add the line  pi@ip -pw raspberry replacing the ip with your Raspberry Pi’s ip address. 
  3. Click OK and you’re done. Now every time you open the shortcut link it will automatically login to your raspberry pi.

That’s it! 🙂

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tinkerBOY DPI Adapter v1.0: Visual Guide for Raspberry Pi Zero (without header pins)

This method does not use a 40-pin header pins but it’s easier. Place the  Pi Zero on top of the DPI Adapter and align the holes. Use a binder clip to hold them together.

Now, start soldering each of the Pi Zero’s GPIO holes making sure there’s a proper contact to each of the holes on the DPI Adapter.

You can also solder from the bottom just to make sure each holes are soldered properly.

The final step is to solder the Pi Zero’s USB data pins (D+ and D-) to the 2 holes on the DPI Adapter. These holes will connect the Pi Zero’s data pins to the D+ and D- pads on the adapter for connecting any USB device. (Note: The D+ and D- pads on the DPI board V1.0 are mislabeled. The upper pad should be D- and the lower pad should be D+. Thanks to Paul for reporting.)

UPDATE: The D+ and D- data pins are now correctly labeled on v1.1 and moved to front left of the board just above the 5v and GND pin holes.

The 5VIN and GND pin holes below the tinkerBOY DPI Adapter are your 5v and GND inputs.

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tinkerBOY DPI Adapter v1.0: Brightness Control

On this guide, I will be showing you how to add brightness control functionality for the tinkerBOY DPI Adapter. You need a tactile button switch for it.

Let’s get started

Wire one pin of the button to the GPIO10 pad on the back of the DPI Adapter and the other to any GND.

On the software side, you just need to download and run a program in the background and just press the button to control the brightness.

Login to your pi via SSH and enter the following command:

wget https://github.com/tinkerBOY-git/RetroPie/releases/download/retropie4.4/pi.sh && sudo bash pi.sh

Now, sudo reboot and you’re done.

You should now be able to control the brightness of you DPI screen by pressing the button.

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tinkerBOY DPI Adapter v1.0: Visual Guide for Raspberry Pi 3

Start by removing the USB ports and ethernet port, cut the header pins, and trim the side of the P1 3 board where you removed the ports.

The idea is to mount the Pi 3 inside the Game Boy DMG case so that the sdcard is accessible via the “CONTRAST” area of the case. Use any rotary tool to trim the upper corners to make space for the 3d printed bracket’s top screw posts so you can easily mount it later inside the case.

Before joining the adapter and Pi 3 together make sure you put any protection like kapton tape in between to avoid shorts. Solder the pin holes from the adapter where the bottom GPIO pins of the Pi 3 are located. Unlike the Pi Zero which can be powered directly from the GPIO pins, the Pi 3 is protected by a fuse so it’s recommended to power it via the PP2(5v+) and PP5(GND) pin. Here’s how you do it.

This how it looks inside the Game Boy DMG case:

The 5VIN and GND pin holes below the tinkerBOY DPI Adapter are your 5v and GND inputs.

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tinkerBOY DPI Adapter v1.0: Visual Guide for Raspberry Pi Zero

Start by placing the header pins in to the pin holes designed for the Pi Zero:

And mount the Pi Zero this way:

It’s recommended to put a kapton tape or anything in between the adapter and pi zero to avoid shorts before soldering the header pins to the Pi.

The next step is to cut the pins and plastic below the header pins and solder them to the DPI Adapter.

The final step is to solder the Pi Zero’s USB data pins (D+ and D-) to the 2 holes on the DPI Adapter. These holes will connect the Pi Zero’s data pins to the D+ and D- pads on the adapter for connecting any USB device. (Note: The D+ and D- pads on the DPI board are mislabeled. The upper pad should be D- and the lower pad should be D+. Thanks to Paul for reporting.)

The 5VIN and GND pin holes below the tinkerBOY DPI Adapter are your 5v and GND inputs.

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tinkerBOY DPI Adapter: Gettting Started Guide

Method 1: Download my pre-built RetroPie image.

Method 2: Manual

Edit the config.txt and copy/paste the following lines:

Save the file.

The tinkerBOY DPI Adapter v1.0 uses a custom overlay for the DPI interface. Download this file, unzip and place the dpi18_666.dtbo file inside the overlays folder in the boot partition of the sdcard where the config.txt is also located.

That’s it for the settings.

Guides for v1.0/v1.1:

NOTE: DO NOT turn the power on without connecting the LCD (LQ035NC111).

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How To Add Brightness Control For The 3.5″ GearBest Screen

This guide might also work on any screen that we use for building our Game Boy Zero as long it uses the CL6201 LED driver IC with the “7001” label on it.

I will be using a Raspberry Pi Zero for this tutorial but any Arduino/Atmel chips with PWM pins can also be programmed to do the job. I have actually tested it with an attiny13a and it works just fine.

Hardware

Before we start, follow the Wiring Guide for the 3.5″ GearBest Screen with 5V Mod. Then start by soldering a wire from the CL6201’s EN pin 4 to the Pi Zero’s GPIO19 pin. The CL6201 Datasheet says that the EN pin can be used to adjust the brightness by connecting it with a PWM square wave signal between 100Hz and 100KHz. That means with the Raspberry Pi’s capability to produce PWM signal we can control the brightness with it.

For the control buttons let’s use two tactile buttons for increasing and decreasing the brightness. Wire the buttons like this:

Software

You can write a program in Python or C to do the PWM routine but let’s keep it simple by using a progam called pigpio and write a simple python to just call it. Login to your Raspberry Pi and install the program by following the instruction at abyz.me.uk/rpi/pigpio/download.html.

Testing

We are now ready to test the program. Type the command sudo pigpiod to load the pigpio daemon. Now we can test it with the following command format:

pigs p GPIO DUTYCYCLE(0-255)

GPIO is the gpio pin we want to use which is GPIO19 and DUTYCYCLE is what controls the brightness.

Example:

pigs p 19 50

The above code should dim the screen. Try experimenting with other DUTYCYCLE values from 0-255.

Now for the actual buttons to control the brightness I wrote a simple python to call the pigpio program. Copy the code below and paste to a new file with .py extension. You can just name it as brightness_controller.py if you want.

Run it by typing the command  python brightness_controller.py. Press each of the buttons and it should increase or decrease the brightness on the screen.

Here’s a demo:

That’s it! Let me know in the comment below if this works for you.

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Wiring Guide for the 3.5″ GearBest Screen with 5V Mod

I get a lot of wiring inquiries about the 3.5″ GearBest Screen so I decided to make one.

Most of these 3.5″ screens are intended for 12v power supply. The 12V input goes to a chip called XL1509 and converts that to 5V. Like any DC to DC converter there’s always going to be wasted power as a result of the conversion. This is the reason why I highly recommend that you do the 5v mod eventhough the screen works if you feed it with 5v without the need for any modification.

To make the connections more reliable let’s remove the Female JST connector..

..just be careful not to lift the contact pads which I’ve mistakenly done here. Luckily the board has two video connections which are AV1 and AV2. I will be using the AV1.

Cut the cable that came with it and solder the wires directly to the board. In order to do the 5V mod, you just solder the RED wire directly to the XL1509’s Pin 2 or to the SS24’s cathode pin which is easier to solder to. The other end of the RED wire goes to your 5v power supply of course (PowerBoost 5v output). Since the Raspberry Pi only requires just one video connection, solder the YELLOW wire to the Pi’s TV connection. Join the WHITE and BLACK wire and solder them directly to the GND pad on the screen board. The WHITE(GNDTV) wire goes to the GND beside the TV pin on the Pi while the BLACK wire goes to your normal powerboost’s GND output.

Yep, That’s it!

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How to Disable Digital Volume

Digital Volume is enabled by default so if you want to use the usual Analog Volume Wheel, you need to disable it and there are two ways you can that:

Method 1:

Press and hold the “SELECT” button for 15 seconds to disable Digital Volume and reboot.

Method 2:

With the builtin usb serial communication of the tinkerBOY Controller v3.0 you can easily enable or disable Digital Volume  In order to do that, you need install the minicom program by following the instruction at tinkerBOY Controller v3.0: Settings or proceed if you’re using my pre-built RetroPie image..

Start minicom by typing sudo minicom. Start by checking the current status of the Digital Volume by pressing ‘d’.

Here’s how to enable or disable it:

  • Press the number ‘0’ to enable or disable Digital Volume.

That’s it. 🙂