Building a Touchable Keyboard

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Socoder -> Hardware and Technology -> Building a Touchable Keyboard
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Fri, 09 Aug 2019, 06:51
steve_ancell	You're better off using a 74HC165 shift register (parallel in serial out) rather than using a resistor ladder, shift registers can also be daisy-chained for even more pins if needed. I did a resistive ladder a while back, it works for one button at a time but not very practical for multiple inputs at a time. In theory it could be done using a resistor ladder but the algorithm may glitch due to voltage spikes or batteries changing voltage on usage etc. Here's a video of me doing the resistor ladder to Arduino thing. Links to files are available in the description. View on YouTube
Fri, 09 Aug 2019, 12:49
spinal	I think I'll give this https://pilizard.blogspot.com/2017/11/the-pi-lizards-64-images.html?m=1 a try, if it really boots straight into vice quick then it might work well. Hopefully I can add an LCD screen to the startup sequence ðŸ‘ -=-=- Check out my excellent homepage!
Sat, 10 Aug 2019, 08:12
spinal	This is the plan, I've just this second built a C64 joystick, I have a master system controller, created 2 joystick ports and I'm about to wire them up. J1 J2 Arduino (U)-----(U)-------18 (D)-----(D)-------19 (L)-----(L)-------20 (R)-----(R)-------21 (F)-----(F)-------14 GND GND-------10 ----- Alternate these pins pulled low and read each joystick every 2nd loop '----------------6 -------' --v I think reading the joystick every second frame is more than fast enough for what I need -=-=- Check out my excellent homepage!
Sat, 10 Aug 2019, 08:48
steve_ancell	Yeah, I reckon that should be quick enough. You could even read both joysticks at the beginning of each loop and then store them in an array for later access within that loop.
Sat, 10 Aug 2019, 11:19
spinal	OK, I'm half done. It seems there is a minor glitch though. It's detecting both joystick correctly, with each one sending the correct key presses. However, if both joysticks are pressing the same direction/button then it releases both. Can anyone see if i've missed a step in reading the inputs or something else just as stupid? #include "Keyboard.h" // joystick pins #define JoyF 14 #define JoyU 18 // A0 #define JoyD 19 // A1 #define JoyL 20 // A3 #define JoyR 21 // A4 #define Joy1GND 6 #define Joy2GND 10 #define joyOld 0 #define joyNew 1 #define joy1KeyFire 234 // numpad 0 #define joy1KeyUp 233 // numpad 9 #define joy1KeyDown 227 // numpad 3 #define joy1KeyLeft 231 // numpad 7 #define joy1KeyRight 225 // numpad 1 #define joy2KeyFire 229 // numpad 5 #define joy2KeyUp 232 // numpad 8 #define joy2KeyDown 226 // numpad 2 #define joy2KeyLeft 228 // numpad 4 #define joy2KeyRight 230 // numpad 6 bool _Up[2][2], _Down[2][2], _Left[2][2], _Right[2][2], _Fire[2][2]; int joyPort = 0; void updateButtons(){ _Up[joyPort][joyOld] = _Up[joyPort][joyNew]; _Down[joyPort][joyOld] = _Down[joyPort][joyNew]; _Left[joyPort][joyOld] = _Left[joyPort][joyNew]; _Right[joyPort][joyOld] = _Right[joyPort][joyNew]; _Fire[joyPort][joyOld] = _Fire[joyPort][joyNew]; if (digitalRead(JoyF) == LOW) {_Fire[joyPort][joyNew] = 1;} else {_Fire[joyPort][joyNew] = 0;} if (digitalRead(JoyU) == LOW) {_Up[joyPort][joyNew] = 1;} else {_Up[joyPort][joyNew] = 0;} if (digitalRead(JoyD) == LOW) {_Down[joyPort][joyNew] = 1;} else {_Down[joyPort][joyNew] = 0;} if (digitalRead(JoyL) == LOW) {_Left[joyPort][joyNew] = 1;} else {_Left[joyPort][joyNew] = 0;} if (digitalRead(JoyR) == LOW) {_Right[joyPort][joyNew] = 1;} else {_Right[joyPort][joyNew] = 0;} } void setup() { // initialize control over the keyboard: Keyboard.begin(); Keyboard.releaseAll(); // set joystick pins to input pinMode(JoyU, INPUT_PULLUP); pinMode(JoyD, INPUT_PULLUP); pinMode(JoyL, INPUT_PULLUP); pinMode(JoyR, INPUT_PULLUP); pinMode(JoyF, INPUT_PULLUP); pinMode(Joy1GND, OUTPUT); pinMode(Joy2GND, OUTPUT); digitalWrite(Joy1GND, HIGH); digitalWrite(Joy2GND, HIGH); } void loop() { /* Keyrah joystick mapping Port 1 up Numpad 9 down Numpad 3 left Numpad 7 right Numpad 1 fire Numpad 0 Port 2 up Numpad 8 down Numpad 2 left Numpad 4 right Numpad 6 fire Numpad 5 */ // First read port 1 (usually player 2) digitalWrite(Joy1GND, LOW); digitalWrite(Joy2GND, HIGH); joyPort = 0; updateButtons(); if(_Fire[joyPort][joyOld] == 0 && _Fire[joyPort][joyNew] == 1) Keyboard.press(joy1KeyFire); if(_Fire[joyPort][joyOld] == 1 && _Fire[joyPort][joyNew] == 0) Keyboard.release(joy1KeyFire); if(_Up[joyPort][joyOld] == 0 && _Up[joyPort][joyNew] == 1) Keyboard.press(joy1KeyUp); if(_Up[joyPort][joyOld] == 1 && _Up[joyPort][joyNew] == 0) Keyboard.release(joy1KeyUp); if(_Down[joyPort][joyOld] == 0 && _Down[joyPort][joyNew] == 1) Keyboard.press(joy1KeyDown); if(_Down[joyPort][joyOld] == 1 && _Down[joyPort][joyNew] == 0) Keyboard.release(joy1KeyDown); if(_Left[joyPort][joyOld] == 0 && _Left[joyPort][joyNew] == 1) Keyboard.press(joy1KeyLeft); if(_Left[joyPort][joyOld] == 1 && _Left[joyPort][joyNew] == 0) Keyboard.release(joy1KeyLeft); if(_Right[joyPort][joyOld] == 0 && _Right[joyPort][joyNew] == 1) Keyboard.press(joy1KeyRight); if(_Right[joyPort][joyOld] == 1 && _Right[joyPort][joyNew] == 0) Keyboard.release(joy1KeyRight); // Next read port 2 (usually player 1) digitalWrite(Joy1GND, HIGH); digitalWrite(Joy2GND, LOW); joyPort = 1; updateButtons(); if(_Fire[joyPort][joyOld] == 0 && _Fire[joyPort][joyNew] == 1) Keyboard.press(joy2KeyFire); if(_Fire[joyPort][joyOld] == 1 && _Fire[joyPort][joyNew] == 0) Keyboard.release(joy2KeyFire); if(_Up[joyPort][joyOld] == 0 && _Up[joyPort][joyNew] == 1) Keyboard.press(joy2KeyUp); if(_Up[joyPort][joyOld] == 1 && _Up[joyPort][joyNew] == 0) Keyboard.release(joy2KeyUp); if(_Down[joyPort][joyOld] == 0 && _Down[joyPort][joyNew] == 1) Keyboard.press(joy2KeyDown); if(_Down[joyPort][joyOld] == 1 && _Down[joyPort][joyNew] == 0) Keyboard.release(joy2KeyDown); if(_Left[joyPort][joyOld] == 0 && _Left[joyPort][joyNew] == 1) Keyboard.press(joy2KeyLeft); if(_Left[joyPort][joyOld] == 1 && _Left[joyPort][joyNew] == 0) Keyboard.release(joy2KeyLeft); if(_Right[joyPort][joyOld] == 0 && _Right[joyPort][joyNew] == 1) Keyboard.press(joy2KeyRight); if(_Right[joyPort][joyOld] == 1 && _Right[joyPort][joyNew] == 0) Keyboard.release(joy2KeyRight); } --v -=-=- Check out my excellent homepage!
Sat, 10 Aug 2019, 11:43
Jayenkai	Nope. I'm afraid I can't see anything obvious. .. you have double checked the hardware, to be sure it's not doing that..?? -=-=- ''Load, Next List!''
Sat, 10 Aug 2019, 13:43
spinal	I can't think of anything that would work for everything other than getting the same reading from both sticks. I have to be missing something â˜¹ï¸ -=-=- Check out my excellent homepage!
Sat, 10 Aug 2019, 14:28
Jayenkai	Make a test proggy that constantly prints out both raw pin 20 values, (joy left) then test if the "both at once" still fails. If it does, it's the hardware doing it. If it doesn't, it's something in your code. -=-=- ''Load, Next List!''
Sun, 11 Aug 2019, 04:23
spinal	OK, after reversing the circuit - pulling each pin low with an external resistor and applying +3v and reading that way, I get a slightly different outcome, I can press the same direction on both joysticks at the same time, but can't press more than one direction on one joystick, that is, UP on both sticks registers, but UP+LEFT on one stick will not. It looks like I'll have to modify it a little and put some diodes in, perhaps the current is back-flowing through the joystick and causing issues? \|edit\| Yup, after a little googling, it seems this is a common problem with reading keypads, you have to have a diode attached to every single switch, or else unexpected shorts will get in the way of reading the buttons. -=-=- Check out my excellent homepage!
Sun, 11 Aug 2019, 04:31
Jayenkai	Crikey. How the smeg did they cope with this shit in the 80s!?! -=-=- ''Load, Next List!''
Sun, 11 Aug 2019, 06:50
spinal	It think that'd be part of the reason that keyboard controls were a bit odd, like z/X for left/right and p/l for up/down maybe specifically choosing keys that wouldn't clash...? -=-=- Check out my excellent homepage!
Sun, 11 Aug 2019, 08:03
Jayenkai	Quite possibly. Still get clashing nowadays (cursors and space) but it's nowhere near as pronounced.. Jus5 shows the amount of amazing things the old 8bits had to deal with! -=-=- ''Load, Next List!''
Sun, 11 Aug 2019, 12:26
spinal	Back on the c64 emulation side I seem to be stuck. I found 2 distros that boot straight into a c64 emulator. One simply will not show up on my network, the other refuses to actually run the emulator as well as network not working also. It's a shame I know nothing about linux at all ðŸ˜Ÿ -=-=- Check out my excellent homepage!
Sun, 11 Aug 2019, 16:39
Jayenkai	I just about managed to bluff my way through what little Linux I've dared to use. My GoogleFu is stronger than my Linuxination! -=-=- ''Load, Next List!''
Fri, 23 Aug 2019, 10:02
spinal	Got my hopes up today as I got an email saying my screen had arrived! Got home, opened it, it's cracked. -=-=- Check out my excellent homepage!
Fri, 23 Aug 2019, 10:02
Jayenkai	Fuck..
Fri, 23 Aug 2019, 11:28
spinal	Meh, I put in a return request. We'll see how that goes. -=-=- Check out my excellent homepage!
Thu, 29 Aug 2019, 14:52
spinal	I'm going to put this here because it took me all week to get it working again for some reason - ____TFT______ _Pro Micro_ [J1][ ] VCC -------- o VCC [ ] GND -------- o GND [ ] CS -[1.8k]- o 10 [ ] RESET -[1.8k]- o VCC [ ] DC -[1.8k]- o 8 [ ] MOSI -[1.8k]- o 16 [ ] SCK -[1.8k]- o 15 [ ] LED -------- o VCC [ ] MISO -------- o 14 --v It seems that the ili9341 tft screens thatare so popular are quite picky about their working conditions. Couldn't get it working with a genuine level shifter, couldn't get it working without one, got it sometimes working, sometimes not working. It seems that throwing in some resistors so that the voltage was lowered enough to be not 5v was most of the trick, but also, the reset pin, which is supposed to be toggled from low to high on a delay before sending the init code simply didn't work, but keeping it high without shifting it from low works 100% of the time. Go figure. -=-=- Check out my excellent homepage!
Thu, 29 Aug 2019, 14:54
Jayenkai	Crikey!
Fri, 30 Aug 2019, 01:09
spinal	Tricky to get the brightness right... What's going to be fun later on, is emulating a keyboard adapter that I don't have access to. I guess just fire up vice c64 on my pc, press every imaginable key and see what the emulator displays and work from there. -=-=- Check out my excellent homepage!
Fri, 30 Aug 2019, 06:30
steve_ancell	I'm impressed.
Fri, 30 Aug 2019, 11:11
rockford	That's really pretty cool
Fri, 30 Aug 2019, 12:08
spinal	Don't be impressed just yet, nothing does anything at the moment ðŸ¤” -=-=- Check out my excellent homepage!
Fri, 30 Aug 2019, 12:16
rockford	It displays an image. That's something. And waaaaaay more than I could ever achieve.
Fri, 30 Aug 2019, 12:28
Jayenkai	Indeed, I wouldn't have a flamin' clue! Most Excellent work! -=-=- ''Load, Next List!''
Sat, 31 Aug 2019, 09:19
steve_ancell	spinal Don't be impressed just yet, nothing does anything at the moment Over all the years I've seen you on the forums, you have always just got on with what you do and have never been afraid of failure. If that's not impressive then I don't know what is!
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