# Questions tagged [algorithm]

An algorithm is a sequence of well-defined steps that defines an abstract solution to a problem. Use this tag when your issue is related to algorithm design.

21 questions
Filter by
Sorted by
Tagged with
640 views

### How do I find the whole number (n) that when multiplied by (m) will be closest to (x)? [closed]

I've designed an apparatus that uses stepper motors, and they are linked together so that when armature A turns, it consequently moves armature B by a ratio of 1/4. In order to keep armature B in the ...
• 494
1 vote
42 views

### Need help with debugging a heartrate/filter code (the heart rate calculation does not work)

The code below is a program that aims to apply the Pans-Thompskin algorithm to a signal attained from a ECG filter. The filter seems to work alright but it fails to blink the LED and collect a correct ...
542 views

### How to determine when a sensor's output signal changes significantly?

Starting with an analog signal from any sensor, how do I automatically determine if there is a real signal change or a reset? Below is the sample code that better explains my goal: value = sensorRead()...
• 43
1 vote
567 views

### Using millis() instead of delay() when playing a melody

I want to make my Arduino to play several simple melodies, and also be able to skip a melody by pressing a button and go on with the next song. therefore I cannot use delay() because the code should ...
• 11
83 views

My goal is to reduce pins being used for micro-controllers with limited pins, or projects requiring a few different digital input values. How I intend to do so is by using ADC pins to gather four ...
• 167
1 vote
53 views

### Port manipulation: Coding for two chips

I am using Arduino Nano to test a code that will be ported on an ATTiny chip, which will need to perform operations at a frequency near clock maximum, calling for a very succinct coding. My goal: to ...
• 167
6k views

### Converting each digit in an integer to its respective ASCII characters

For example what would be the process of converting the integer 1023 into ascii characters of 0x31 (1) 0x30 (0) 0x32 (2) 0x33 (3) Not looking for any library functions (I know of Serial.print() and ...
1 vote
215 views

### How to detect patterns in an FFT output?

I have an FFT output from a microphone and I want to detect a specific animal's howl from that (it howls in a characteristic frequency spectrum). Is there any way to implement a pattern recognition ...
102 views

### Built-In Digital Map for Robot Driving

So, I'm creating this project for school. It's a simple robot with Arduino MEGA 2560 and basically, I create a digital map, feed it into the Arduino program and then the robot can drive. However, I've ...
• 124
926 views

### Maze solving robot turning failure due to sensor distance to the corner increasing during the turn

At my school we have a project where we have to make a robot that can solve a 3D-maze using an arduino controlled robot that uses ultrasonic sensors to determine how to turn. The robot may not be pre-...
360 views

### comparison in a time sequence [closed]

in an Arduino sketch a user is invited to input a number representing a time in the format HH:MM, this number is to be added at the end of an ordered and limited sequence of times --the first input (...
• 55
1 vote
335 views

### Detect where pressure is being applied by using force resistors

I have 3 force resistors in a row, on top of which I have placed a board. I read values from the resistors through analogue ports. My goal is to be able to detect whether someone is pressing on the ...
• 175
1 vote
1k views

### How do you balance an Arduino quadcopter using calculated gyro values?

I was working on an Arduino quadcopter project. I setup all my hardware and was having balancing problems with my software end. I am using an MPU-6050 gyro and accelerometer. I have calculated the ...
• 27
86 views

### Call function and not came back

Im having a little problem with my code. here i called a function to make a test, if it passed it goes back and continue if it doesn't it goes to main loop. void loop() { if (call == 1) { ...
8k views

### Compute yaw from magnetometer and accelerometer

I use an Arduino and a 9 DOF sensor (gyroscope, accelerometer and magnetometer) and I'm trying to use the pitch, roll and yaw that the sensor gives me to rotate an object in unity. I managed to ...
• 163
1k views

### Algorithm to detect motion using ultrasonic sensor

I have a PIR sensor which sometimes give false readings and I have added a ultrasonic sensor to compensate for that. I think my algorithm can work, however currently it is very prone to give false ...
• 105
3k views

### Algorithms to reduce measurement error from analogue sensors

When reading analogue sensors - e.g. load cells, accelerometers - via a microcontroller's Analogue to Digital Converter, there are many sources of potential measurement error including: a) Warm-up ...
• 153
2k views

### How to detect if more than one button was pressed

I am designing a turn signal bicycle blinker using two pushbuttons as input, one for each side, with a corresponding light for each button. The idea is this: Pressing one side makes same side start ...
• 503
1 vote
6k views

### Using I2C: Master Reader and Writer

I'm using I2C and the Arduino Library (Wire) to communicate between two Arduinos, and my code isn't working. It's supposed to read in an int from the slave, write a value to the slave, then read back ...
2k views

### Exoskeleton Motor Control Code

Background: I have been working on an exoskeleton project with a group of friends, and I need help. I made another post on the robotics.stackexchange site for the drive system: https://robotics....
• 523