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. And also plot a simple graph to visualise the figu
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Read about Power saving techniques for microprocessors ATtinyPowerMeter: This instructables show how to make a simple power meter using 3 components: ATtiny85, INA219 and OLED module.It can continuous measure the voltage(V), current(mA) and accumulated power usage(mWh). You can save quite a bit by using lower voltages as well, as you can see. The datasheet shows that current decreases at lower frequencies. We are using Vcc as reference voltage hence used.ġ Answer1.
REFS0, REFS1, REFS2 bits are used to select reference voltage used with ADC. ADMUX - ADC Multiplexer Selection Register: ADMUX register should be used to configure ADC peripheral in ATtiny85. Let's look into the configuration of this ADC in ATtiny85 controller. The maximum analog input voltage to this microcontroller can range from 0V to 5V.If you're concerned about power consumption, the ATtiny85 chip boasts impressive power efficiency: - Functions with a supply voltage of between 1.8-5.5V its 10MHz in the V implementation - The 20MHz version can still run from 2.7V-5.5V, allowing it a wide range of power option.If I use a 9v battery I'm sure I will need something to bring down the voltage, I'm just trying to grasp OHMs law, based on my notes I have these forumulas: Voltage: V = IR Current: I = V/R Resistance: R = V/I PowerP = VI or P = V 2 /R or P = I 2 The ATTINY85 is rated as: Voltage - Supply (Vcc/Vdd): 2.7 V ~ 5.5 V.By executing powerful instructions in a single clock cycle, the device achieves throughputs approaching one MIPS per MHz, balancing power consumption and processing speed The device achieves a throughput of 20 MIPS at 20 MHz and operates between 2.7-5.5 volts.Most of the data sheets also have a section with a graph showing the output voltage, (Source), as both a function.īuy Attiny85 at Amazon - Check Out Attiny85 That is the Voltage, Output, High state, Minimum, which is 4.3 V, when running the micro at 5 V. Typically they come with between 1K and 16K of program memory and 512 bytes of SRAM and 512 bytes of EEPROM. An introduction to the ATtiny85/45/25 | Andys Workshop The ATtiny range of microcontrollers are ATmel's smallest and lowest power 8-bit AVR offerings.Total number of Analog Input pins are 6 Contains 8 kilobytes of flash memory Contains 512 bytes of SRA Low power consumption in operating mode on 1.8 volts current consumption is only 300uA & on power down mode current consumption is only 0.1uA on 1.8V.Attiny85 Pin Configuration It is an 8 pin IC as shown in Atiny85 pin diagram shown above It has 8 Kbytes of In-System Programmable Flash and is popular because of its compact size and its features. ATtiny85 is a high performance, low power 8-bit microcontroller based on Advanced RISC Architecture.There are guides on using a High-Voltage Programmer (HVP) to change the Reset pin into an IO pin Unfortunately it only has 5 IO pins, which limits its usability. The Atmel ATTINY85 is a great chip (cheap, easy to use, supported in the Arduino IDE).