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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Help using an attiny85 and ir receiver

I'm trying to use 2 attiny85, one with an IR transmitter and one with an IR receiver (2 pins). I can't figure out how to use the attiny85 with the receiver. Help would be appreciated! If it is not ...
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57 views

DC motor working on Arduino but not Attiny with batteries [duplicate]

I have a simple working circuit to control a DC motor with an Arduino as indicated in the Arduino examples. For instance, ...
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65 views

How to prevent DC motor from dropping voltage of supply when switching on

I have a circuit which uses an ATtiny85 output to a transistor (S9013), which will trigger a relay that controls a motor. The reason for the transistor to relay is because I do not have a transistor ...
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128 views

Relay not switching correctly, controlled from ATtiny85, output to motor

I have an ATtiny85 switching an NPN transistor, which will in turn switch on a relay that will run a motor. Everything is run off a 3.7V 18650 Li-Ion battery, but I have since moved over to a variable ...
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300 views

ATTINY85 measuring internal voltage

I'm using an ATTINY85 for a portable application that uses a Lithium-ion battery; therefor I need to monitor the battery voltage so I don't kill the battery. Is there a way to go about this without ...
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40 views

ATtiny85 to control a relay, which will turn on and off a motor

I am trying trying to control a 5V relay (SRD-05VDC-SL-C) with the ATtiny85. I have a simple sketch uploaded (Blink without Delay example): ...
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attiny25 doesnt want to sleep (attiny24 does)

I have an attiny25 and an attiny24 both run the same (striped) code. They shall do something (e.g. toggle a pin), go to sleep for some time and get woken up by the watschdog timeout interrupt (WDT is ...
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61 views

power 5.5v/1.8v mcu from lipo: 12v + LDO = 3.3, or just pull from one cell?

I'm trying to power an ATTiny44 (1.8v/5.5v) from the balance port of an RC 2s/3s lipo. The circuit will use very little ma, sleeping 29secs/1ua?, wake 1 secs/10ma. EDIT: the circuit is a Lost Model ...
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67 views

Should I use a voltage regulator?

I'm powering an attiny45 from a single lithium ion battery; that when fully charged should have a maximum voltage of ~4volts and will be cutoff at 3volts. I was thinking I should be safe to just ...
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47 views

Low voltage cutoff circuit

I'm powering an attiny45 from a lithium ion battery; using these batteries the voltage cannot get below 3volts or it will damage the cell. How should I go about cutting the voltage out? Software, or ...
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78 views

AVR GCC: How do I improve code optimization

I tried to compile he following C code: period = TCNT0L; period |= ((unsigned int)TCNT0H<<8); The assembler code I'm getting is the following: ...
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603 views

Why does my AVR reset when I call wdt_disable() to try to turn the watchdog timer off?

I am having a problem where executing a disable watchdog sequence on an AVR ATtiny84A is actually resetting the chip even though the timer should have plenty of time left on it. This happens ...
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81 views

Mixed SPI and I2C using ATtiny USI

I've been successfully using the USI on an Attiny84 to talk SPI to a radio module. This is good for hacking up sensors and whatnot as little radio devices. My next sensor project involves a sensor ...
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4answers
89 views

Sound Chips for attiny [closed]

Is there some kind of chip ( that doesnt use an SD Card ) so i can play prerecorded sounds using my ATtiny? I'm talking about the kinds of things in toys like Zoomer and furby etc
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73 views

Will MCP23017-E/SP be compatible with an ATtiny85? ATmega328P?

I mainly want to also be able to use the same I/O expanders with ATTiny85 projects since those chips have limited pins. I will be doing the main prototyping on an ...
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156 views

Boost Converter Problems

I'm having trouble with a boost converter I made: it outputs 1.2V with no load and 2.4 with one. I expect to draw 0.25 Amps MAX with Roughly 0.2 Amps continuous. My battery pack is 2P2S NiMH with the ...
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84 views

Adafruit Trinket Solar Power

I'm curious if anyone has experience with getting a simple board like the Adafruit Trinket or DigiSpark or any of the other ATTiny based clone boards running on solar power. E.g. with a solar panel ...
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67 views

Attiny84 has a slow rising and falling edges

I'm using an Attiny84 to generate 100us pulses for a totem pole gate driver. I was expecting rise and fall times in the order of 10's of nanoseconds, what I got was rise times of 7.8us (10% to 90%) ...
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50 views

Interacting with the host OS

I am wondering if an ATMEL micro controller such as an ATMEGA8 or ATTINY2313 has libraries to interact with a computer (windows OS) over USB? If so is there any premade libraries that does the bulk of ...
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69 views

Serial communication with the ATTiny85

I'm moving my project from the Uno to the smaller ATTiny85, and I'm having some problems. It builds and uploads just fine, but I think I've messed up the serial communication somewhere along the way. ...
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6answers
488 views

WLCSP MCU's - what hardware is needed for programming these tiny chips?

I just received my DigiKey order of some Atmel ATTiny4 MCU's from DigiKey. I wanted to tinker with one of the smallest MCU's I could find, and this was one of them. It is, in fact, so small because ...
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2answers
118 views

Delay introduced by transistor

I have the following circuitry: PWM-2V8 is a square 50% 40kHz signal as this (R37 not populated on this capture): On P8, I get the following signal which is distorted and the duty is more like ...
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173 views

How often do AVR's actually glitch and need a watch-dog reset in the real-world?

Have you ever seen an otherwise happy AVR spontaneously glitch and require a reset? Assuming: a nice stead power supply that stays inside the specified range a correctly sized decoupling cap ...
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93 views

Can you set the PWM output of an Atmel AVR to a specific frequency and have control over duty cycle?

I'm trying to drive an LED at 38kHz with a low duty cycle like 10% from an Atmel ATTiny88. The chip is currently running at 8MHz, but could be adjusted for this portion of code, if need be. Using ...
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193 views

ATTiny project resets when plugging in phone

Project I'm not very experienced with electronics and microcontroller-programming yet. I recently (accidentally) bought a couple of ATTiny13A microcontrollers, assuming I could program them using ...
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1answer
215 views

How do I avoid a reset when using the watchdog in interrupt mode and changing the timeout?

I'm writing a program for an ATtiny85. I want to use the watchdog to wake up from power down in certain intervals. It all works fine as long as the intervals for a watch dog event don't change within ...
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1answer
125 views

I'd like to improve this design to support ICSP

I'm new to electronics and this is my first circuit. I have some questions about implementing ICSP in this design. This is a bit of a long post with quite a few questions so I'll apologize in ...
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191 views

Porting Code from Arduino Uno/ATMega328P to ATTiny85 not working, too many variables?

I have an Arduino Uno and am running a sketch with lots of variables (23 constant char arrays that have 54 object in each array). Along with all these variables there is lots of if statements. The ...
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140 views

Can I run a program, on an ATtiny85 with micronucleus bootloader, without usb connected?

I have managed to put micronucleus bootloader on an ATtiny85. Using it, I can successfully upload programs to my ATtiny through USB and they run as they should, as long as they are connected to USB. ...
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53 views

Inverted PWM with ATTiny10

On a 10MHz ATTiny10, the following code generates the same 40kHz 50% duty PWM on both pins 0 and 1: ...
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297 views

ATTiny85. How do I use the reset pin as an analog input or digital output?

According to this datasheet, the ATTiny85 has 6 I/O pins if we include the reset pin. I used five of them to charlieplex 18 LEDs and I need another one to use as analog input. Would it be possible to ...
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227 views

AVR SRAM limitation

I'm just an enthusiast looking for some advice. I'd like to use a microcontroller to read frames from a camera and write those frames to a small LCD screen. The camera and screen are on the same SPI ...
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95 views

Cannot program ATTiny85 fused for 32 kHz

Now, I know what you're thinking. I've been thinking it all night too. Yes, I know that with the tiny fused for a 32 kHz crystal that I'll need the SPI clock to be 8 kHz or less. Even that, however, ...
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73 views

Square wave 40kHz with ATtiny10

I'm using a 12 MHz ATtiny10 and I would like to generate a square wave on PB0 at 40 kHz. I think that I need CTC. What should be the values of TCCR0A, TCCR0B, OCR0A and OCR0B?
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171 views

ATtiny2313 vs ATtiny84 software compatibility

I make and sell a variant of the USBtiny AVR programmer. It uses an ATtiny2313 clocked at 12 MHz and does bit-banged USB using hand-tuned assembly language (that someone else wrote - it's an open ...
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167 views

Does the Atmel-ICE Debugger work on ATtiny MCUs?

I've looked on the interwebtubes and could not find out if the Atmel-ICE debugger works with ATtiny MCUs. In theory, since the debugger supports debugWire and SPI modes, it should, but the official ...
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154 views

driving LEDs via a PI a attiny and TLC5940 (validation) and possible powering issues

at the moment I am planning my first real (big) electronics project. I want to build a LED lamp, that can be controlled by a RaspberryPi (for e.g. programming a binary clock or changing the brightness ...
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120 views

Small low-power device-to-device proximity detector

I would like to find or create a small low-power proximity detector to tell a device when another device is near. This would be coupled to a small microcontroller like the AT-tiny 45. It doesn't ...
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3answers
593 views

How much current is a powered-down ATtiny84 supposed to take?

I know this sounds like a stupid question, but I'm wondering if the datasheet has an error or something. I have an ATtiny84 connected to my bench power supply set for 3 volts. It's fused for the ...
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112 views

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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951 views

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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612 views

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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2answers
105 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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2answers
207 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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1answer
406 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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1k 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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1answer
651 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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234 views

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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77 views

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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3answers
451 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 ...