Questions tagged [attiny]
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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How to check led current
I'd like to check if a lamp shines and if it's dead, a relay is supposed to switch.
I thought about using an attiny with a hall sensor.
There are some sites that complain about the inconcurrency ...
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31 views
ATmega168 versions for low power applications
I am interested in using an ATmega168 for a simple application, which has however very strict power limitations. As a result, the important thing for me is to find the version with the least power ...
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2answers
92 views
Generating 40 kHz square wave using ATtiny13
I'm using an ATtiny13 running at 1.2 MHz and would like to generate a 40 kHz square wave on PB3 and PB4. The signal on PB4 should be 180 degrees offset (inverted) from PB3.
I know that I need to set ...
0
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1answer
36 views
Establishing common ground between attiny and 24v motor, and between attiny and 12v logic circuit, without connecting 24v motor and 12v logic grounds
I have a coin hopper which has a 12V logic circuit and a 24V motor. It also has 2 brass plates which sense the amount of coins in the unit, one plate has high voltage, and second has low. These plates ...
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50 views
Alternatives to a hardware configuration of an input pin for uC
I'm trying to figure out how to read-in a configuration to the small ATtiny10 microcontroller.
I want to find out 5 or 6 different configurations, adjustable by hardware into one IO using the same ...
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41 views
ATtiny Series 1 High Voltage HVSP 12V Enter into UPDI
I'm unable to find usable information on how to enter into UPDI mode after disabling UPDI on new-ish ATtiny Series 1 MCUs, e.g. ATtiny412/817/3216 etc.
There some information for older devices like ...
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2answers
64 views
ATTiny1616 writing the SUT fuse in SYSCFG1 with AVRDude Command Line
I want to write the SUT fuse in SYSCFG1 to be 0x0 for 0ms startup time as per page 40 of the datasheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny1616-3216-DataSheet-DS40001997C.pdf
I am ...
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1answer
61 views
Simplex UART echo implementation on ATtiny
I'm currently trying to implement a simple UART echo application on the ATtiny85, with no additional pins other than RX/TX (no autoflow control).
I'm using the Universal Serial Interface of the ...
0
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1answer
35 views
AVR ATtiny1634 - PB3 as Input and Watchdog Timer
I'm quite a beginner in AVRs and this is my first project soldering the microcontroller and programming it on board. I know the ATtiny1634 QFN might not me the best micro for a beginner, but ...
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1answer
117 views
AVR ATtiny1634 - Programming Issue
I've have already used Arduino as ISP Programmer to load codes to Atmel chips like ATmega328p and ATmega8 quite a few times without any problem.
On my last project though, I decided to use an Atmel ...
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1answer
77 views
How to avoid a MCU to run constantly when a superheterodyne radio receiver is receiving nothing, and possibly enter in deep sleep?
TL;DR: How to avoid an ATtiny to run constantly when the radio receiver is receiving nothing, and possibly enter in deep sleep mode? Configuration:
ATtiny45 (on breadboard)
SRX882 Superheterodyne ...
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1answer
87 views
Why does my MCU work better when powered to Vcc and PA1=D2 instead of Vcc and GND?
I'm making a MIDI processor, with its power coming ... directly from the MIDI signal itself, as done by the author of this page (see "Powered by MIDI" paragraph): it works well with a 100µF cap. I ...
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43 views
what's that symbol in the attiny13a I/O schematic? [duplicate]
I was reading the ATtiny13A datasheet and I can't figure out what's that symbol in the general digital I/O schematic. I've circled it the figure below.
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2answers
160 views
Circuit to know when two batteries are connected to each other
I'm using a Victron Cyrix (12V 120A) Smart battery combiner to connect the starter and the leisure battery in my RV. I wanted to know when the two batteries are connected to each other, but ...
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2answers
176 views
“Normally closed” switch: does it use more power than a “Normally open” for a low-power battery-powered ATtiny project?
I have a "normally closed" magnetic door sensor, that I'd like to use with an ATtiny microcontroller.
Does a "normally closed" switch use more power than a "normally open" switch?
i.e. since the ...
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2answers
58 views
Switch AtTiny1614 on and off
I have built the following circuit to reset an AtTiny1614 (the mega tiny 1 series). They don't have a reset switch and I thought with this circuit I could (hard-)reset the chip by doing a power cycle.
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3answers
184 views
Gosh darn PORT structs on AVR
To my shock, Atmel has restructured the way they do port addressing in the ATtiny-avr-one series (1616 for example.). I am writing a function that takes in a pin and a port and sets the corresponding ...
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3answers
2k views
How to make a PCB based on ATtiny easily updatable by end users?
I've made a prototype PCB containing an ATTINY 4313:
Each time I want to change the program, I upload it with an Arduino used with the "Arduino as ISP" sketch.
If one day I sell such a module to ...
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3answers
132 views
GND arriving to the wrong pin of this chip on my PCB
I had originally done a PCB for another chip. All pins I'm using (1, 2, 3, 17, 18, 19, 20) are fortunately correct for the ATtiny4313 I'm now using, except GND that arrives on pin #4 of my PCB ... ...
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2answers
156 views
Read 8 serial ports at the same time with an Attiny
I'm building a MIDI merger, based on a Attiny (either 84 or 85).
How to read multiple serial ports at the same time (for example 8 RX inputs)?
I can't find the blog article anymore, but I think I ...
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1answer
110 views
Arduino to Attiny841 with ATTinyCore — pins not working
I have code that works using Arduino.
Because I wanted to size down the project, I replaced it with an Attiny841.
Process:
I soldered the 841 on an adapter and checked all pins using a multimeter ...
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1answer
99 views
Can I generate frequencies faster than 32 MHz with ATTINY85?
I believe I can use the 64 MHz PLL clock with PWM to toggle every cycle
and thereby generate a 32 MHz square wave output on an IO pin, right?
Is there a trick to generate an even higher frequency (...
4
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1answer
110 views
Amtel ATtiny EEPROM partially erased on power cycle
I have a Digistump with an Amtel ATtiny85 MCU. I can flash the MCU's EEPROM with an ISP programmer no problem. The chip works fine, the bootloader runs and the user program executes correctly.
...
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2answers
79 views
Simulate Shift Register on AVR (Configurable Logic/Timers?)
Recently I set up two MCUs (ATtiny1616) to perform basic serial communication using shift registers I made myself.
simulate this circuit – Schematic created using CircuitLab
Here is the logic ...
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1answer
79 views
Toggle power between modules/devices
I'm absolutely new to this subject and I have no idea how to start, save for the fact that I need an microcontroller for this.
I want to toggle the power between modules/devices I want to hook up to ...
0
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1answer
61 views
reading a high negative voltage with attinys running on batteries
I need to read a negative input voltage from a camera flash capacitor that can charge up to -330V. I am using an attiny85V that is running on batteries and want to set the internal reference voltage ...
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2answers
88 views
DC Boost Converter stepping up voltage very slowly, if any
I've come across DC boost converter and told myself - why not to try it as well? So I started building a simple circuit which includes BD243C NPN Transistor, ATTiny13A programmed to give some pulse to ...
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1answer
58 views
Does Attiny13 pull a lot more current in sleep mode than Attiny85 or did I do something wrong?
First off here is the code I have tested on both Attiny13A and Attiny85V:
...
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1answer
32 views
IR range problem after coding burst/gap rate and ratio for TSOP1236
I programmed an ATTINY13 to drive an IR led on 36kHz with this code:
...
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2answers
122 views
Extremely low data rate transmission over long distance for attinys
For a lighting project I need to be able to trigger 20 units every couple of seconds independently which are daisy chained with 1-2 m space between each of them like so:
Control station ====== Unit 1 ...
3
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2answers
149 views
Not enough current draw through MOSFET
I am trying to control the current to a Raspberry Pi using a MOSFET and an ATtiny10. I am using a logic level MOSFET and it seems that the Pi needs about 250mA to turn on but it is only able to pull ...
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1answer
62 views
MOSFET switch, ATtiny10, Raspberry Pi
I had posted a question earlier but I was using a BJT at the time and the solution provided led me to use a MOSFET for my application instead. I switched to the FET but still unable to provide stable ...
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1answer
69 views
ATTiny167 USB Programming
On Aliexpress I am finding many cheap development boards with ATtiny167 and a USB connector.
From what I can gather these boards permit USB programming through USB emulation. Can anybody point me to ...
0
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1answer
128 views
Transistor as a switch for 3A collector current
I am using:
ATtiny10 w/ 10Ohm Resistor in series to drive Base of transistor
Transistor is ZTX688B
Vcc is 5V and 3A source
Load is a Raspberry Pi connected to Collector
simulate this circuit –...
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0answers
127 views
TRIAC broke (literally) – why?
I have built a circuit according to Dimming 230V AC with Arduino, with two output channels. The basic principle is:
An ATtiny does zero detection via an optocoupler; when AC crosses 0 V, it triggers ...
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1answer
142 views
How can I isolate an ATTiny from an I2C slave so ICSP will work?
I'm building a small circuit to blink some LEDs with an ATTiny. I'm planning to use a 16-channel LED driver and talking to it with an ATTiny over I2C.
I'd like to use a SMD ATTiny and add some test ...
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1answer
78 views
progmem data array optimized out [closed]
I try to use a ATTiny10 to drive some APA102 LEDs.
The LEDs are arranged in a 5x5 array. To draw something I stored some 'images' in PROGMEM. Program looks like this:
...
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1answer
55 views
ATtiny icsp pins dual purpose
I am using an ATtiny88 in a pcb design. It is directly driving a LED matrix. I am only driving half bytes at a time, so the max current limit will be followed.
It is my understanding that I can dual ...
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1answer
80 views
LED-strip PWM works with Raspberry Pi, doesn't work with Attiny45
I'm trying to control an RGBW analog LED-strip by PWM modulation.
When using an Attiny45 the LED-strip just blinks at a low frequency (approx. 2-3 hz). However, using a Raspberry Pi 3 to control PWM ...
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3answers
3k views
Does ATtiny RESET pin need a resistor?
I need to make sure that my ATtiny does not reset unexpectedly. To do that, I am planning on connecting the RESET pin directly to VCC.
However, I have heard some places that you need a 10k resistor ...
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1answer
61 views
ATtiny45 program/reset issue
I'm pulling my hair out trying to get this ATtiny45 to work, hopefully someone out there can help.
The ultimate goal is to drive an RGB LED strip using PWM, but I'm getting some unreliable behavior ...
0
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1answer
73 views
How do you add an onboard ISP for an ATTiny85?
I've taken a liking to building circuits around the ATTiny. Typically I add 6 headers and use an AVR programmer or an Arduino to program the ATTiny in circuit.
I'm trying to figure out how move that ...
0
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1answer
173 views
Easiest (or cheapest) way to get both 5V and 3.3V on one circuit
I'm working on a circuit based on an ATTiny85 and I need accelerometer input. I was looking at using an analog accelerometer (KXTC9-2050 that runs around 240 uA) because I have the extra pin and I'm ...
0
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2answers
168 views
Use ADC as Analog Comparator (AttinyAVR)?
I have recently been trying to transition from Atmel's Atmega 328p avr to the newer (and much smaller) attiny416. The trouble is, the 416 only allows you to choose between two positive inputs and two ...
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105 views
Drive 433Mhz emitter and Attiny with two coin cells
I would like to detect when the postman put mail in my box, so I was thinking about a simple attiny with tilt sensor (which would wake up the attiny) and a 433 MHz emitter:
The problem is that one ...
2
votes
1answer
148 views
Sound sensor not working when connected to DC motor
I made a small circuit to control a DC motor with a sound sensor, using an ATtiny 85 and an L293D.
It worked on breadboard, but now that I have a prototype PCB it ceases to work. Whenever I connect ...
0
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1answer
72 views
How do I maintain ICSP functionality?
I'm a novice hobbyist building a trivial circuit where an ATTiny 85 controls an RGB LED. In addition to the three PWM outputs, I have 2 inputs.
The first input is a potentiometer I'm using to set ...
0
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2answers
176 views
Attiny45 12V LED Driver
I want a fading effect on a 12V led strip when power is turned on/off. I want to keep it simple and efficient, so I choose an Attiny45. The problem is that for the Attiny to work, I would first need ...
0
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3answers
357 views
How to switch PIR sensor on/off based on photocell result
I've built the following circuit based on an ATtiny85 for a night lamp. The circuit is powered by a 3.7v LiPo battery. I'd like to turn off the PIR sensors when the photocell detects light in order to ...
0
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1answer
133 views
Low voltage LCD glass displays
I have a simple circuit I built using a 7-segment LCD glass display and an ATTiny (just a simple timer for now). I was hoping to use the setup in a low power, single coin cell device (3.3V - 2.7V), ...
