ATtiny is a family of small, low-power 8-bit RISC microcontrollers from Atmel. Commonly found in smaller Arduino prototyping platform boards and projects.

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ATtiny85 absolute ratings for outputs?

The ATtiny85 datasheet specifies an absolute maximum negative voltage for any pin of -0.5 volts relative to ground. Consider this partial schematic: MOSI and MISO are the respective ATtiny85 pins ...
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Control relay from Bluetooth on ATtiny85

I know someone else has made a Bluetooth transmitter to a relay so i wanted to ask a few questions about it being possible? I am an almost newbie at electronics but i do know a few things, so first of ...
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ATtiny85 power consumption double expected

I'm trying to get an ATTiny85 to run off a battery. I have it clocked from a 16.384 MHz crystal, with the divide-by-8 fuse set. Vcc is 3.3 volts. Figure 22-7 in the datasheet says that at idle ( ...
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53 views

No response from AVR microprocessor while programming

I've been attempting to program a few different micro-controllers using nothing but an FTDI 5V TTL cable and self-written software to bitbang the needed pins on the chips. Until now I had success only ...
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77 views

How many inputs can a single mcu output drive?

I am planning a project that will have many ATTiny chips connected together. The idea is that a master node will send various control signals that every slave node will listen to. My system could ...
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69 views

nRF24L01+ RX in pulsed operation to save power?

I'm considering building a handheld radio receiver based on an nRF24L01+ and an ATtiny chip. It needs to receive "continuously", to receive a control signal that might operate some attached LEDs or ...
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74 views

How can I tell that USBasp is working?

I have the USBasp programer and I'm trying to burn bootloader on Atmega328 so that it can be used as a replacement chip in Arduino board (replacement chips with the bootloader installed are quite ...
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283 views

Arduino Uno to ATtiny44A I2C communication

I tried to make I2C communication from Arduino Uno to ATtiny44A. Uno as Master and Transmitter code: ...
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Mystery while driving a NeoPixel Ring (WS2812) with a GEMMA (ATtiny85)

I am working with an Adafruit GEMMA and NeoPixel Ring 16 LEDs (ATtiny85 and 16 WS2812 leds) and trying to get a program to light the LEDs according to my "pattern" structure below, representing R, G, ...
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Battery recharge protection for a dual-power ATtiny board

I have a small board with ATtiny85 and it has a button cell battery socket on it. The battery that I'm using is CR2032 rated 3V. At the same time, while programming it there will be second power ...
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331 views

Boost DC voltage converter for wireless temperature sensor (1.5V to 5V)

I'm trying to design a wireless temperature sensor powered by one (or maybe two) rechargeable NiMH AA cell(s). The sensor should read and transmit the temperature every couple of seconds and remain in ...
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74 views

Can I use the ATtiny84 ADC0 pin as both input and output?

I am using the ADC0 (PA0) pin of an Attiny84 to read analog values from an audio circuit. This part is working fine. Since I need to connect the Attiny84 to 8 LEDs, I'd like to use the ADC0 pin as an ...
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Why shouldn't I brute force PWM?

So I've been playing with an ATtiny45, and it occurs to me that I could probably brute force PWM by prescaling a timer to sysclock/64, then running ISR code that manually switches the outputs on or ...
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98 views

ATtiny84 resets on high load

I'm using a ATtiny84 and with three 74HCT595 serial to parallel converters to drive 24 LEDs. Every thing works fine, but when I try to light up more than 10 LEDs at the same time, the ATtiny84 program ...
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214 views

Attiny44A Arduino Multitasking

I am trying to blink a led as well as switch a motor on/off parallely using attiny44A below is my code: Pump Controller: ...
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144 views

Problems Re-Flashing ATtiny85 After Setting prescale to 0x00

After flashing the ATtiny85 with code including setting the clock prescale to 0x00 (in code, not flashing the fuse), the next time I try and flash I get the following errors preventing me from doing ...
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68 views

Is there any online or free to download (for Windows 7) AVR simulators? [closed]

I'm currently using CodeVision AVR to write a code. Let's say I have a compiled HEX file and I'd like to try it running on a virtual processor (ATtiny861A). Google gives me some results but I'd ...
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472 views

Attiny85 hardware interrupt unreliable, 433 MHz remote

SCROLL DOWN TO SEE THE SOLUTION (UPDATE II) ORIGINAL POST: I am currently building a 433MHz remote with two buttons. The remote is controlled by an Attiny85v(8MHz). Sadly it does not work very ...
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272 views

What does the 'A' letter in Atmel's ATtiny devices mean?

I have both on stock: ATtiny861A-SU and ATtiny861-20SU. But I can not find out any difference between them except 'In-System Programmable via SPI Port' available for 'A' version. Could anyone tell ...
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141 views

WS2812 with ATtiny5 Microcontroller Code

I'm having problems with driving a single WS2812 driven LED. I'm using a much more compact version of the code here which is basically I just put in the methods I need and put it all into one file ...
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307 views

ATTiny85 to power two RGB LED strips

Currently I am trying to control two RGB LED strips with an ATTiny85 microcontroller that I programmed with an Arduino Uno. The program I have basically fades the two LED strips between blue and ...
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49 views

Fixing ATtiny45 Clocksource

I accidently changed my ATtiny45 clock source to 128khz . After that I can't program it . I tried avrdude in terminal mode but it doesn't work . ...
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How many servos can I run on an ATtiny85?

This is my first time asking a question on this website, so please correct me if I'm doing something wrong... I have been working on a small project which runs three Servo motors on an ATtiny85, ...
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102 views

ATtiny85 simulation in AtmelStudio 6.1 (build 2730, SP2)

I have written a piece of code which manipulates the DDR for port B: ...
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259 views

How to program Atmel ATtiny88 (not 45 or 85)? [closed]

There are lots of tutorials for programming the ATtiny45 and 85 with a breadboard and Arduino, but how would I program the ATtiny88? It's an 8 bit AVR microcontroller, but it can not be mounted on a ...
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108 views

Does MCU RAM size affect quality of WAV read from SD?

I'm planning to build a cheap and compact WAV audio player that reads audio from a Petit-FatFs microSD card. The Petit-FatFs filesystem is designed for use with devices with less than 512B RAM. My ...
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131 views

attiny44a 12 MHz external crystal

I am having this configuration set in my arduino uno: Programming ATtiny84 / ATTiny44 with Arduino Uno I have even uploaded the blink LED program(using arduino sketchbook) and it works great at 8 ...
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130 views

Decoupling issue with DC Motor?

I have the following circuit : That's basically everything, excepted a button on DC1 to turn on/off the motor, but shouldn't impact. The problem is, I was prototyping with the DC Motor on the ...
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214 views

ATtiny45 Timer1 clock misconfiguration

I am overlooking something with a very simple program for my ATtiny45. A program that divides the 16MHz system clock by 16 and outputs that on pin 5 (OC0A) using Timer0 and on pin 6 (OC1A) using ...
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381 views

ATtiny 85 io High Voltage

I've search all over to no success. I tried the data sheet, but couldn't make heads or tails of it. What is the voltage of an output pin of the ATtiny 85 when high? is it just the same as the input ...
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3answers
253 views

Recognizing low-pass filters

Does the capacitor in this circuit serve as a low-pass filter? The premise of the circuit is to be a small SD card based music player. The write up, Simple SD Audio Player with an 8-pin IC, says ...
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253 views

Using a piezo disc as an input and output device to ATtiny85

I am working on an art installation and plan to use a number of these small circuits to make sounds, to sense sound/vibration and also to move the device (using a triangle wave output). This link ...
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308 views

Counter: pulse every 8 clocks

I have a square signal (fixed but can be between 12MHz and up to 48MHz) and I would like to create every 8 clocks a pulse as brief as possible, no more than 1/4 of the period. First, a couple of ...
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225 views

ATtiny45 pin change interrupt PB5?

On the ATTiny45 data sheets it states that PB5 can be used as a digital IO pin and I want to use it to trigger a pin change interrupt, my only issue is that it is also the reset pin and the moment I ...
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529 views

Program ATTiny45 with Atmel Studio and Arduino ISP

Is it possible for me to somehow upload the application I have written with C++ in Atmel studio with the Arduino ISP that I can use in the Arduino ide. I have no idea how to do this and I also have no ...
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502 views

Arduino-tiny Attiny45 PWM pins not working properly?

I am trying to use an Attiny45 as an Arduino such as here http://www.forkrobotics.com/2012/04/run-arduino-code-on-an-attiny/ using the Arduino-tiny cores. Now according to the diagram on the site pin ...
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Looking for AVR MCU with internal PLL clock source with more than 8 pins?

The 8-pin AtTiny x5 MCU (ie. AtTiny25, AtTiny45 and AtTiny85) can be set to use it's internal clock source to something as high as 16Mhz without any external components by setting PLLCLK which would ...
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Arduino as ISP for ATtiny

I am attempting to use an Arduino Duemilanove as a tool to program an ATtiny85 from the Arduino IDE. I was using the instructions at ForkRobotics which are ... Upload ArduinoISP sketch to Arduino ...
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362 views

ATtiny: no support for multiplication?

Is it true that the ATtiny AVRs have no hardware support for multiplication? It seems to work fine as I do multiplication in my code. I've also included math.h and have a couple of sin() and cos() ...
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426 views

AVR ATtiny2313 fuse-bit confirmation

I'm programming an ATtiny2313, with some hex for an infrared remote IgorPlug with AVR via USB, I'm new to AVR and need to confirm please that what he refers to the fuse configuration: Q: Is ...
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Problem programming ATTiny85 “Invalid device signature.”

I am trying to program ATTin85 using Arduino I used the hardware support file from "High-Low Tech" here http://hlt.media.mit.edu/?p=1695 With this schematic: After downloading the ArduinoISP ...
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How to wire a button for input on an Attiny85 using Arduino code?

I am trying to "shrink" my arduino project to an Attiny85. But for some reason I cannot get an input button to work on the Attiny85? To simply the circuit and to make sure I didnt make a mistake ...
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How to power an Attiny from AA batteries?

I am working on a project where I would like to power an RGB Led in a ambient light situation. I have prototyped this using an Arduino Leonardo and the led. Currently the project is plugged into the ...
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219 views

In search of a component or device that switches multiple lines based on input selection

Okay so the foundation for my curiosity is that in dealing with Arduinos, I found they can be used to program the similar but smaller ATtiny chips. This is the main hookup configuration that some of ...
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What can't the ATtiny do that the Arduino can?

Inspired by this Make Magazine youtube video, I would like use the ATtiny chips instead of the Arduino for most of my projects. The video author warns that some Arduino functions won't work on the ...
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368 views

How to connect attiny to serial port so that I can use it with Arduino IDE

I have sucesfully assembled a circuit to use Arduino UNO as a programmer for ATtiny13. However, my plan was to only burn bootloaders to my ATtinys, so that I can program them the very same way I ...
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How to connect ATTiny13 to USB?

This may be on the limit of ATTiny13 possibilities, but still: is it possible to connect ATTiny13 to USB to get ADC readings (one way)? According to this article http://www.vk2zay.net/article/211 ...
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High-voltage programming of ATTiny13 with AVRISPmkII and avrdude?

I am in the process of learning on how to program ATTiny13-20pu, and am reading this post: http://www.vk2zay.net/article/211 (archived: http://www.webcitation.org/6Imwjmidx ), which explains how to do ...
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AVRISP mkII not reading device signature

I recently bought a dozen ATtiny85 MCUs and I was trying to test one simply by putting a blink program on it via the Arduino IDE with and AVRISP mkii (Arduino 1.0.5, Ubuntu 13.04). I kept getting an ...
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444 views

ATTiny Circuit only works when connected to AVR ISP

I've got a very simple circuit (as you can see from the diagram below) with an ATTiny45 and a piezo buzzer. Everything worked great as I was testing it out and had the ISP (an AVR ISP MkII) attached. ...