Questions tagged [attiny]

An 8-bit, low power AVR microcontroller from Atmel.

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How do I set up an ATTiny861A-PU for flashing with Arduino Uno?

I have found instructions for 8 pin Tiny but none for my 20 pin. How do I set this chip up on the breadboard for bootloading with Arduino?
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2answers
526 views

Using ATiny102 as HID device(emulating mouse)

I am trying to make my own mouse/keyboard from an attiny (it doesn't have to be attiny102 as the title suggests). I have read many articles on this subject: some are using v-usb library.But I ...
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43 views

Radio receiver: deep sleep when no byte arrives, and wake up when a byte arrives?

This code works to listen for bytes via radio (with a 433 Mhz receiver module) with the Manchester library and Manchester code, and do an action when certain bytes are received: #include "Manchester....
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1answer
115 views

How to assign an interrupt to a button press with an ATtiny? (interrupt not fired with my code)

(Here is finally a solution). I'm using the following code on a ATtiny45 to assign an interrupt to a button press (pin #7, PB2, INT0). However the LED doesn't blink when the button is pressed, as if ...
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2answers
73 views

How to deep sleep ATtiny/ATmega (to run for years with batteries) but still detect a button press?

Question (TL;DR): what is the optimal method to deep sleep (to run an ATtiny45 or ATmega on batteries for 1+ year) but still be able to detect a button press? Is it possible to deep sleep until a ...
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3answers
43 views

PCINT0, PCINT1, PCINT2, etc. on ATtiny45/85

According to the datasheet: we could think that, if we want to have a pin change interrupt for 3 pins, we have to create multiple instances: ISR(PCINT0_vect){ ... } ISR(PCINT1_vect){ ... } ...
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1answer
94 views

How to control the power of attiny13a via pin change interrupt?

I'm trying controll the power of attity13a and turn off/turn on the led. I'm going to goals: After to click on the button0 led will blicking 5 second nad then the attiny13a going to sleep. After to ...
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1answer
32 views

Arduino IDE with ATtiny85 error “multiple definition of `__vector_5”

I am having a problem compiling the code for my ATtiny85 circuit. I am using the timer/counter0 in normal mode so that when it overflows it triggers the TIMER0_OVF_vect ISR. When I have that ISR in ...
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2answers
57 views

How to use ATtiny pins that are usually 'reserved' for chip programming?

How to program an ATtiny45 to use the pins 1, 5, 6, 7 (i.e. PB5, PB0, PB1, PB2) as input or output? pinMode(5, OUTPUT); pinMode(0, OUTPUT); pinMode(1, INPUT); pinMode(2, INPUT); digitalWrite(5, HIGH);...
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42 views

How to unbrick an ATtiny45?

I'm using an Arduino Uno as ISP Programmer to program a standalone ATTiny45 on a breadboard. Usually it works well, but I just uploaded a code like this: void setup() { pinMode(0, OUTPUT); # pin ...
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1answer
52 views

Having trouble figuring out CTC on Timer 1 with ATTiny85

I'm using Timer1 on the Attiny85 clocked at 1MHz to toggle an LED every 1 second. However, I'm having some issues regarding prescaler and OSC value selection. I'm using this formula, which I found in ...
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164 views

Use ATtiny85 to perform initial config on a Cisco router using its USB console port

We have 200+ brand new Cisco routers that have USB console ports (but not the old RJ45 serial console ports). This is quite frustrating because the routers didn't ship with console cables and Cisco ...
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2answers
75 views

Arduino IDE won't use selected port

I'm trying to program an ATtiny85, using an AVRISP mkII programmer (this one: https://www.amazon.de/dp/B00IYNAXUC/ref=cm_sw_r_sms_c_api_i_VXOWDb3H3N5ND) with the Arduino IDE (version 1.8.10 on Ubuntu ...
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1answer
66 views

Is changing values in boards.txt and choosing Burn Bootloader enough to write fuses?

I am using Arduino IDE to program ATtiny84A connected to an Arduino Uno and Programmer set to Arduino as ISP. I would like to modify low and high fuse bits for ATtiny84A. As far I do not understand ...
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2answers
642 views

Digispark ATtiny 85 - not recognised as HID device

I am trying to create auto-username-writer with Digispark ATtiny 85. I have a pretty simple sketch: #include <DigiKeyboard.h> void setup() { } void loop() { DigiKeyboard....
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2answers
173 views

Use std::list in Arduino programming

When trying to compile #include <list> std::list<byte> l = { 7, 5, 16, 8 }; in the Arduino IDE (with ATtinyCore for ATtiny4313), I get this message: error: list: No such file or ...
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1answer
35 views

Sending multi-byte data over I2C between different processors

I have been attempting to read data from an ATTINY84 via an ESP8266. Both are programmed via the Arduino IDE, though as PlatformIO is a proxy for that, I'm not certain what version of the ATTINY core ...
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2answers
350 views

Attiny85 Timer 1 comparator B doesn't work properly (while A does)

I'm writing a simple program that is using Timer 1 comparator B to generate a square wave on DEBUG_PIN. So my code at first turns on timer 1 with prescaler 8192 so that one tick is approximately 1ms....
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1answer
55 views

Attiny85 Watchdog fires only once

I build something like a flashlamp with different modi. From the hardware site it's quite simmilar to the Nanjg105c. There is a Attiny85 which generates a PWM signal to an AMC7135. I have one push ...
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1answer
77 views

Current mouse pointer position with Digispark attiny85

I am trying DigiMouse library for attiny85 Digispark board. It allows to emulate the mouse quite well. However, I also need to know the current cursor position. Is there a way to get it?
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2answers
323 views

AtTiny85 and MMA8452Q accelerometer cannot connect using i2c

I am trying to connect the MMA8452Q with AtTiny85 using the TinyWireM library. I made the proper hardware setup with pull-ups on SCL and SDA pins - tested it on Arduino Uno and it works, however ...
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81 views

Attiny ADC at voltages less than 5v

So, this is peculiar. I am using an ATTINY84 chip as an i2c ADC converter (there are reasons why I'm using this rather than a dedicated chip, but that's not really relevant), and I've noticed that I ...
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1answer
85 views

Increasing speed of Vl6180x Sensors

I have 5x vl6180x pololu ToF sensors. I have managed to hook up all of the sensors to the arduino via I2C by making each sensor startup at different times and when they do, changing their addresses, ...
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1answer
41 views

How can I adapt this code for the ATTiny85?

So I set up an Arduino circuit that while a button was pressed, a sound effect would play and an LED would activate until I stopped pressing the button. Since I didn't use a micro sd card module, I ...
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1answer
79 views

How can I make FastLED set every 2 LEDs to the same color?

I'm controlling an WS2812 LED strip in which every 2 leds is controlled together - they are setup as "eyes" in a prop. I'm looking to control hundreds of these, so in an effort to save RAM I'd like ...
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2answers
1k views

Problem with programming an ATtiny85: Error - avrdude: Yikes! Invalid device signature

I'm trying to program an Attiny85 chip using an Arduino Uno as an ISP following this two tutorials: Instructables: Program an ATtiny With Arduino and Programming an ATtiny w/ Arduino 1.6 (or 1.0) but ...
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0answers
802 views

Manchester 433MHz Nano to ATTiny85

My transmitter is a Nano, the receiver is a Tiny85. I use a Logic Analyzer to check if stuff is moving, I can clearly see data coming in at the receiver. The receiver does not 'decode' the data, man....
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750 views

ATtiny85 Comparator C interrupt on timer 1

I have a program that uses Timer1 comparator A in CTC mode. I realize that I need to set OCR1C for the timer to reset at given value. However there is no such thing as an interrupt generated by timer1 ...
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512 views

Manchester.h message format

I'm sending some data by 433Mhz transmitter using manchester.h library from here https://github.com/mchr3k/arduino-libs-manchester and I'm trying to wrap my head around message format. In manchester....
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424 views

I2C on ATtiny85 and Si4703 radio

I've got an Si4703 breakout from Sparkfun, which communicates via I2C. I have gotten it to work very easily using a regular 3.3V Arduino Pro Mini, but am now trying to move everything over to an ...
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143 views

Integer corruption

I use a sensor to measure the temperature. This is returned as float. I feed this float using typecasting (int) to a blink function. This works fine. But the next is step is using this same unchanged ...
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2answers
5k views

RCSwitch on Attiny85

I would like to use my Attiny85 as an remote controlled relay switch. I have already tested the sketch on my Atmega328 and it worked. Now I wanted to burn the sketch on my Attiny85 using ArduinoISP ...
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3answers
46k views

When using Arduino Uno as ISP does “Yikes! Invalid device signature” mean a bad connection, bad config, or bad version of avrdude?

I'm using an Arduino UNO to program a pre-compiled hex image to an ATTINY45, using the avrdude in the Arduino IDE directory, on Windows 7. The Uno has the ISP sketch loaded from the examples directory ...
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1answer
38 views

Which pins are represented by these constants from ABR library?

The following code comes from AtTiny serial library that I want to use: #include <avr/io.h> #include <avr/interrupt.h> #include <util/delay.h> // change these to use another pin #...
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2answers
4k views

ATTiny85 and DHT11 - Sensor always returning 0

Good day. I am making a small weather station using ATTiny85, DHT11, and an OLED display. There are many, many tutorials that explain how this works, and various libraries that show you how to get ...
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1answer
135 views

AtTiny analog read always 1023

I am trying to replicate Low power LED firefly project. So what I'm trying to do is to do an analog read from a LED, to detect light. To simplify it a bit, I am using different pins and different leds ...
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1answer
221 views

Digispark Micro (ATTINY85) not working on Macbook Pro 2016

I just bought 2 Digispark Micro to start learning some Arduino things. But when I try to upload the code to my Digispark, it just send me an "Device search timed out" error. My Digispark is plugged ...
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1answer
35 views

Can I program an ATtiny87 with Arduino

I have a project, and I want to use an ATtiny167(ATtiny87), I know that an Arduino can progam ATtiny84 (84/44/24), ATtiny85 (85/45/25), and ATtiny2313 (4313). but I don't know if it can program an ...
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2answers
502 views

ATtiny85 LM75 I2C

I would like to read temperature from a LM75 using the ATtiny85 running a core by SpenceKonde and utilizing the TinyWireM library. My Logic Analyzer does not pick up any I2C communication, when I ...
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2answers
1k views

I2C communication between Attiny85 as master and arduino UNO as slave

I want to make my Attiny85 and my Arduino UNO communicate together with I2C protocol. Since Attiny do not support Wire library, I use TinyWire by lucullusTheOnly and Wire on the Uno. The Attiny is ...
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1answer
69 views

My software serial code won't work at > 4800bps

I've put together a simple software serial (send-only) implementation for use on my attiny8[45] microcontrollers. I realize that there are more efficient USI-based implementations out there; this was ...
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116 views

Software reset on Micronucleus possible?

I'm wondering if anyone knows if it's possible to do a software reset using the watchdog timer on a microcontroller using the Micronucleus bootloader. When I try it, it doesn't fully reset, as in ...
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4answers
2k views

Generating a 38 KHz signal without timers

I am currently trying to generate a 38 KHz signal for my TSOP4838 (http://www.vishay.com/docs/82459/tsop48.pdf) with an ATtiny84A. I know the real thing would be to utilize a timer but the ATtiny ...
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1answer
402 views

RadioHead and DallasTemperature error

The RadioHead library only runs on a very old core for the ATtiny85. It sends data but I would like to send something useful. The problem is I cannot read any sensors using this core. And on any other ...
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0answers
92 views

Why does the program size increase so drastically with these switch-cases?

EDIT: The problem is my op-code catch is op >= 0x20 || op <= 0x2F rather than op >= 0x20 && op <= 0x2F and so most of the switch-case was being optimised away! This is a really ...
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1answer
199 views

Controlling LED and Button with single pin

I am trying to use an ATTINY85/Ardunio Uno to turn an LED on and listen to a button input. I don't mind if the LED turns on when the button is used. I am have found this thread from a couple of ...
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1answer
737 views

AtTiny44 and AtTiny 85 communication

I'm working on a project where I use two microcontrollers: an AtTiny44 (20MHz ext clock) and an AtTiny85 (8MHz internal). What I'm trying to achieve is an I2C communication between the 85 and the 44, ...
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2answers
1k views

Digispark ATtiny85 keyboard

I have a small project that I have in mind and I'm pretty new with Arduino. I want to make a small device that if a key was pressed it would do something. Now I know I could use a button with the ...
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1answer
8k views

Emulating 1-wire device(s)

What I want to do is make a ATTiny IC become a slave on the 1-wire bus, with its own S/N and command list for its specific functions. What I want to know is if I can use the one wire library from ...
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1answer
568 views

Adafruit Trinket M0 persistent storage?

I am using an Adafruit Trinket M0 to program a small game and would like to save the game state every so often. I am programming it through the Arduino IDE as the chip does not have enough space to ...