Category Archives: Making Stuff

Quick Pogopin Holder

If you’re looking for a quick way to align and hold pogopins in a single line, try out a “DB” connector (ex. 9/15/25 — aka, old atari joystick style). The female connector hold the pins perfectly and is easy to solder to.

Only works for a single line (row or column) of pins, so not helpful for my 2×3 needs, but may help others.

XBOX Adaptive Controller (XAC) with Custom Arduino Joystick — Working Code

At long last I’ve revisited my problem with getting the Arduino Leonardo / Pro Micro to work with the XBOX Adaptive Controller (XAC). This code now works with the XAC! Huzzah!

More to come. I’m working on a Nintendo JoyCon Joystick version for a user with limited mobility.


include “Joystick.h”


true, true, false, false, false, false,
false, false, false, false, false);


const boolean debug = true;


//Joystick variables – Button (with debounce)
int SEL, prevSEL = HIGH;
long lastDebounceTime = 0;
long debounceDelay = 50; //millis


//Joystick pins

define VERT_PIN A9 // AKA the “Y” — dependent on how thumbstick is oriented

define HORZ_PIN A8 // AKA the “X” — dependent on how thumbstick is oriented

define BUTTON_PIN 7 // Pushbutton of the thumbstick

//Mapping to XBOX Adaptive Controller
//X and Y will auto map to Axis 0/1 or 2/3 depending on which side you plug
//the joystick into (left=0/1 or right=2/3). The pushbutton on the stick needs
//to be set & programmed depending on placement. TODO: Some sort of config on stick?
//10=Left Stick Press, 11=Right Stick Press



int rawHorz, rawVert;
int mapHorz, mapVert;

//invert if needed
bool invHorz = false;
bool invVert = true;


void setup() {

//Startup the joystick object.
Joystick.begin(false); // false indicates that sendState method call required (so we do all changes at once).

//I’m using Map below, but setting range Just In Case.
//Also setting Axis to zero at startup.
Joystick.setXAxisRange(-127, 127); Joystick.setXAxis(0);
Joystick.setYAxisRange(-127, 127); Joystick.setYAxis(0);

//Set HORZ and VERT pins (from joystick) to input

if (debug) {



void loop() {

// —————————————————-

// Check for button push – and debounce
int reading = digitalRead(BUTTON_PIN);
if (reading != prevSEL) {
lastDebounceTime = millis();// reset timer
if (millis() – lastDebounceTime > debounceDelay) {
if (reading != SEL) {
SEL = reading;
if (SEL == LOW) {Joystick.pressButton(XBOX_AC_STICK_BUTTON);}
else {Joystick.releaseButton(XBOX_AC_STICK_BUTTON);}
prevSEL = reading;

// —————————————————-

//Read analog values from input pins.
rawHorz = analogRead(HORZ_PIN);
rawVert = analogRead(VERT_PIN);

//Map values to a range the XAC likes
mapHorz = map(rawHorz, 0, 1023, -127, 127);
mapVert = map(rawVert, 0, 1023, -127, 127);

if (debug) {
Serial.print(“RAW H/V: “);
Serial.print(” “);
Serial.print(” “);
Serial.print(“MAP H/V: “);
Serial.print(” “);

if (invHorz) {mapHorz = -mapHorz;}
if (invVert) {mapVert = -mapVert;}


// —————————————————-

// Send updated joystick state to HID upstream



frotz on the Pocket CHIP

Got frotz working on the Pocket CHIP. Now I can run Interactive Fiction games (ex. Infocom) on the move, while using a discontinued hardware device. 🙂 At least I finally put it to use.

Photo taken in 2016, when I originally got it, and it sat without a use.
Now, in 2019, I dust it off and install frotz.
Got Hitchhiker’s running!

Enabling SSH Server on Pocket CHIP

Before you do anything, check out the mirrored documentation found at The site has mirrored the sources, so you can actually run updates again. Thank you, JF!

# Pocket C.H.I.P. (Pocket CHIP)
# Installing SSH Server on Pocket CHIP
# Note: When using sudo (do as sysadmin) the password is “chip”

* Open Terminal

* Move to apt directory
> cd /etc/apt/

* Update sources.list
> sudo nano sources.list

* In sources.list, replace with
* CTRL-O to write out (save). CTRL-X to exit.

* Updates preferences
> sudo nano preferences

* In preferences, replace with
* CTRL-O to write out (save). CTRL-X to exit.

* Update with jfpossibilities as the repository (instead of the defunct nextthing)
> sudo apt-get update

* Install SSH Server
> sudo apt-get install openssh-server

* Start the SSH Server
> sudo service ssh start

* Get the IP address. You can look on your router, or:
> ip a
* Look for the wlan0 inet entry (looks for your subnet, etc 192.168.x.)

* On your PC, use WinSCP or similar to SSH into that IP.
* The user will be “chip” and the password is also “chip” (if you didn’t change default).
* You should now be able to easily transfer files between your PC and the Pocket CHIP.

# Why I Did This
# Not a whole lot of the use for the device, but it’s portable, has a screen and keyboard…so…
# How about Interactive Fiction / Text Adventures? The old Infocom games. Running the Z Machine.

# How to install FROTZ — the Z Machine

* Do all of the above to get SSH Server running (makes it easier to copy games from PC).

* Instal frotz
> sudo apt install frotz

* In /home/chip/ you can create a folder called games
> cd /home/chip
> mkdir games

* I then used WinSCP to copy to Z5 game files to that directory (/home/chip/games/)

* Now to run them. Navigate to the /games/ directory.
> cd games

* Run frotz
> frotz [gamename].z5

* For example: > frotz leather_goddesses_of_phobos.z5

# Do some web searches to find z5 files. I found this site helpful:

AutoScope 2.0 : Coding The Scans

I got the X and Y limit switches working. Not perfect, but good enough to move forward. Spent yesterday coding “go home” “go center” and a preliminary “scan slide”.

Limit switches. Y is on bottom, X is on top. Bracket also holds Z (other side, not visible, not currently connected).

Slide Center is currently hard-coded based on “eye balling” one of my sample slides. I’ll have to come up with something more scientific. 🙂

The level of magnification determines the steps per photo — inverse ratio (lower the mag, higher the # of steps). It follows the mag values, but I’ve tweaked to give some additional overlap. The steppers and gearing are good enough for over 1000x (the optics, not so much).

I’ve also directly connected the camera to the microscope (not going through an eyepiece). These images are roughly 300x. 3D printed a little 32mm adapter tube.

As I play with it, I’m coming up with a list of stuff to do: add a Cancel/Abort/Panic button (hooked to an interrupt). Allow user to set scan ranges. Allow user to set center. Save default values?

Also thinking through a proper case for it.

I’ve used this sized enclosure for other projects. A good amount of room to work in.
Display, board, buttons, drivers — need to be stuffed into a box.

Of course, also working through how I’m going to trigger cameras.