Summary of GAS DETECTOR CIRCUIT ATTINY45
This article introduces a gas detector circuit project utilizing the AVR ATtiny45 microcontroller. It highlights the challenges of implementing gas sensors, such as the need for temperature compensation and heater control, which are often managed by external components. The ATtiny45 is proposed as an efficient solution to replace these external parts using its internal ADC, timers, and temperature sensor, ensuring reliability and accuracy while reducing power consumption and cost for portable safety applications.
Parts used in the Gas Detector Circuit ATtiny45:
- AVR ATtiny45 microcontroller
- Gas sensor with internal heater and gas sensitive resistors
- Analog-to-Digital Converter (ADC)
- Timers
- Internal temperature sensor
- External comparators
- Spare logic components
Gas sensors are employed in a wide range of applications in the fields of safety, health, instrumentation etc… Common examples are domestic/commercial alarms for explosive or toxic gases or in automotive application, as gas… Electronics Projects, Gas Detector Circuit ATtiny45 “avr project, microcontroller projects, “
Gas sensors are employed in a wide range of applications in the fields of safety, health, instrumentation etc… Common examples are domestic/commercial alarms for explosive or toxic gases or in automotive application, as gas leakage detectors for LPG powered cars and exhausts detectors inside any fuel-powered truck/car. Such sensors, nowadays, are found also in applications involving air quality control systems and pollution monitoring.
Today’s sensors, while featuring an high sensitivity to a wide gases variety, are very compact in size and have significantly reduced their power consumption to better adapt to portable solutions.
Building a system with a gas sensor is not as easy as it could appear. Despite the sensor could be treated basically as a variable resistor (which value depends on gas concentration in air) the practical implementation in a project should be done considering some design rules, especially if the final circuit is a device to be used in a field where reliability is strongly required (e.g. safety). As an example the internal elements of a sensor (heater and gas sensitive resistors) have to be constantly kept under control to avoid failures leading to a wrong alarm indication; furthermore, if the application needs to achieve a good measurement accuracy, factors like environment temperature, sensor life etc… have to be taken into account.
All those features and controls require to introduce in the project a certain amount of external circuitry (including components like comparators, temperature sensor, spare logic etc…) to carry out functions such us temperature compensation, sensor heating control, sensor warm-up time, sensor life time check and so on…
This project aims to show how the AVR ATtiny45, by means of its peripherals such us ADC, timers and internal temperature sensor, fits perfectly this application and it can be employed to replace a lot of external components while adding extra functionalities at a cost comparable to a simple integrated
Source: GAS DETECTOR CIRCUIT Gas Detector Circuit ATtiny45 project files: gas-detector-circuit-attiny45.rar alternative link2 alternative link3
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What fields commonly employ gas sensors?
Gas sensors are employed in fields of safety, health, instrumentation, domestic alarms, automotive applications, air quality control systems, and pollution monitoring. -
Why is building a system with a gas sensor not easy?
It requires considering design rules like controlling internal elements such as heaters and resistors to avoid failures and accounting for factors like environment temperature and sensor life. -
How does the ATtiny45 help in this project?
The ATtiny45 fits the application perfectly by replacing many external components through its peripherals like ADC, timers, and internal temperature sensor. -
Can modern gas sensors be used in portable solutions?
Yes, modern sensors are compact in size and have significantly reduced their power consumption to better adapt to portable solutions. -
What functions do external circuitry components carry out?
External circuitry carries out functions such as temperature compensation, sensor heating control, sensor warm-up time, and sensor life time check. -
What determines the value of a gas sensor treated as a variable resistor?
The value depends on the gas concentration in the air. -
What additional functionalities does the ATtiny45 add?
The ATtiny45 adds extra functionalities at a cost comparable to a simple integrated circuit. -
Where are gas leakage detectors for LPG powered cars found?
They are found in automotive applications as gas leakage detectors for LPG powered cars and exhausts detectors inside fuel-powered trucks or cars.
