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steve_ancell	Created : 10 March 2017 My Arduino experience.
As many of you know, I've been playing around with Arduino since recently. I've made a video to demonstrate that a 4x4 membrane keypad can be used without the need for any keypad libraries. Here's the video, I will be uploading a circuit diagram shortly. View on YouTube

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Friday, 10 March 2017, 13:33
Jayenkai	That looks like a fun project to work on. I really should get into electronics, some day...
Friday, 10 March 2017, 13:37
steve_ancell	It's easy enough to get into Jay, keeps the brain ticking.
Friday, 10 March 2017, 13:39
steve_ancell	Let there be code! int rowPins[4] = {9, 8, 7, 6}; int colPins[4] = {5, 4, 3, 2}; const int rowCount = 4; const int colCount = 4; char keyChars[rowCount][colCount] = { {'1', '2', '3', 'A'}, {'4', '5', '6', 'B'}, {'7', '8', '9', 'C'}, {'*', '0', '#', 'D'} }; int keyStats[rowCount][colCount] = { {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0} }; void setup() { // put your setup code here, to run once: Serial.begin(9600); for(int row = 0; row < rowCount; row++) { int pin = rowPins[row]; pinMode(pin, OUTPUT); } for(int col = 0; col < colCount; col++) { int pin = colPins[col]; pinMode(pin, INPUT); } } void loop() { // put your main code here, to run repeatedly: char keyChar = GetKey(); if(keyChar) { Serial.println(keyChar); } } char GetKey() { char keyChar; for(int row = 0; row < rowCount; row++) { int rowPin = rowPins[row]; digitalWrite(rowPin, HIGH); for(int col = 0; col < colCount; col++) { int colPin = digitalRead(colPins[col]); if(colPin == HIGH && keyStats[row][col] == 0) { keyChar = keyChars[row][col]; keyStats[row][col] = 1; } if(colPin == LOW) { keyStats[row][col] = 0; } } digitalWrite(rowPin, LOW); } return keyChar; } --v
Saturday, 11 March 2017, 12:29
spinal	cool. @jay, if you get one of the arduino kits and things designed for them, it can be done entirely without soldering etc. just plug and play, sort of.
Saturday, 11 March 2017, 19:21
steve_ancell	I'm experimenting with a piezo transducer at the moment, I've had it giving out alarm sounds. Now I'm trying it as a sound detector, it flashes the onboard LED but the piezo needs to be tapped sharply on the table. I will be making an amplifier circuit to make it more sensitive, got enough transistors and resistors but just need to rob a capacitor from anything I have lying around.
Thursday, 16 March 2017, 18:26
steve_ancell	Another video done. This time I configured it to play tones through a speaker when keys on the pad are pressed. Files and circuit diagram is in the description but, considering this is SoCoder, I had damn well better place a direct link here. Linkage! View on YouTube
Sunday, 19 March 2017, 18:24
steve_ancell	Here's another one: Files: Linkage! View on YouTube
Monday, 20 March 2017, 03:49
Jayenkai	Neat! Makes me want to "start somewhere!"
Monday, 20 March 2017, 13:11
steve_ancell	If you do then get the cheap Chinese UNO, they're only a few quid so you won't lose much if you managed to blow it up. I've not had any problems with mine yet even though I give it loads of abuse. I will be getting one of the other cheap UNOs at some point, this time the one with the DIL chip instead of the surface mount one that I have on this one. That way I can program it and then transfer the standalone chip to a permanent project, you save space that way. Also gonna get a programmer board for PIC chips.
Monday, 20 March 2017, 13:15
steve_ancell	You also need to remember to put a 10K resistor from any input pins to ground in order to pull it low, or you will get really bad undesired effects. Although I am gonna toy around with not using a pulldown resistor at some point, I discovered the possibility of using it in that way to make a proximity sensing application.
Monday, 20 March 2017, 20:27
steve_ancell	Very crude way of detecting proximity. Files for this project: Linkage! View on YouTube
Friday, 24 March 2017, 12:42
steve_ancell	More code and tubage!, playing around with a servo this time. Files for this project: https://drive.google.com/open?id=0BxShBC9w_oHPNS1ycGVwTDQ5azQ #include <Servo.h> Servo servo; int servoPin = 2; float servoCentre = 1500; float servoMicroSecs = servoCentre; float servoStep = 0.1; float servoMin = 750; float servoMax = 2250; int downPin = 8; int centrePin = 7; int upPin = 6; void setup() { pinMode(downPin, INPUT); pinMode(upPin, INPUT); pinMode(centrePin, INPUT); pinMode(servoPin, OUTPUT); servo.attach(servoPin); } void loop() { int downPinStatus = digitalRead(downPin); int upPinStatus = digitalRead(upPin); int centrePinStatus = digitalRead(centrePin); if(centrePinStatus == HIGH) { servoMicroSecs = servoCentre; } if(downPinStatus == HIGH) { servoMicroSecs = (servoMicroSecs - servoStep); if(servoMicroSecs <= servoMin) { servoMicroSecs = servoMin; } } if(upPinStatus == HIGH) { servoMicroSecs = (servoMicroSecs + servoStep); if(servoMicroSecs >= servoMax) { servoMicroSecs = servoMax; } } servo.writeMicroseconds(servoMicroSecs); } --v View on YouTube
Friday, 24 March 2017, 13:29
steve_ancell	With the amount I've been learning about Arduino, I guess I will be scouring eBay for parts soon so that I can start building bots and stuff.
Friday, 24 March 2017, 13:43
Jayenkai	Next stop.. Mr Beakotron enters Robot Wars!!
Friday, 24 March 2017, 13:45
steve_ancell
Friday, 14 April 2017, 12:15
steve_ancell	I've just finished another project. This time I've done a Winforms C# application that has sliders, it communicates with the Arduino to tell it where to rotate the servos to. I'll be doing a video and posting the code and project files later, watch this space!
Friday, 14 April 2017, 18:17
Jayenkai	Sounds like you're slowly preparing to build yourself a robot!!
Saturday, 15 April 2017, 04:56
steve_ancell	Here be some more Arduinage. Multiple servos, controlled by Arduino, tamed be C# Winforms application. Files for the project: Linkage! And here be Tubage! View on YouTube
Wednesday, 19 April 2017, 15:43
zzoom	Kool and the gang, nice work
Wednesday, 19 April 2017, 17:02
steve_ancell	Thanks zzoom. I'm looking into the possibility of using a shift register to do the same thing but without needing to use too many outputs on the board itself, that way I should be able to control loads more servos and various other stuff besides that.

My Arduino experience.

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