Humidity Sensor – Humidity to Frequency Output
https://www.electronics-lab.com/humidity-sensor-humidity-to-frequency-output/
This sensor board provides frequency output as per relative humidity value. The project is based on a unique capacitive cell, this relative humidity sensor is designed for high volume, cost-sensitive applications such as office automation, automotive cabin air control, home appliances, and industrial process control systems. It is also useful in all applications where humidity […]
LED Fading Effect / LED Strobe using 555
https://www.electronics-lab.com/led-fading-effect-led-strobe-using-555/
In general, generating an LED fade effect requires a microcontroller or another expensive circuit. We have built this low-cost LED fading board using an inexpensive 555 Timer. The 555 timer is used as an astable multivibrator, which generates low-frequency pulses, further, this pulse train is feed to the base of BJT transistor TIP122 with a […]
60W LED Dimmer for 12V LEDs using 555 Timer
https://www.electronics-lab.com/60w-led-dimmer-for-12v-leds-using-555-timer/
The project shown here is a cheap 60W LED dimmer for 12V LEDs/12V LED strips. The circuit is based on the very popular, versatile, and low-cost 555 timer IC, NE555 IC generates a PWM signal and IRF540 MOSFET works as output driver for the LEDs. In this circuit the 555 IC used in an astable […]
Free Elektor Circuit – An NE555 Watchdog Timer
https://www.electronics-lab.com/free-elektor-circuit-ne555-watchdog-timer/
from an Idea by Wolfgang Borst (Germany) Virtually every modern microcontroller has a built-in watchdog. It prevents the microcontroller ‘hanging’ which may be the result of a programming error or an unforeseen operating condition, where, for example, the program becomes trapped in an infinite loop and no longer reacts to external or internal input. In […]
12V NE555 PWM Controller
https://www.electronics-lab.com/12v-ne555-pwm-controller/
baelza.bubba @ instructables.com build his own PWM controller which is able to operate as a 12V Motor Speed Controller, LED Dimmer, Heat controller, voltage controller for an electrolytic etcher etc. I did some hunting around on the interweb and found a pretty good starting point in Circuits Today, but then, I needed to make […]
Power-on Reminder with LED Lamp
https://www.electronics-lab.com/power-on-reminder-with-led-lamp/
Many a times equipment at workstations remains switched on unnoticed. In this situation, these may get damaged due to overheating. Here is an add-on device for the workbench power supply that reminds you of the power-on status of the connected devices every hour or so by sounding a buzzer for around 20 seconds. It also […]
Warning LED Flash Light
https://www.electronics-lab.com/warning-led-flash-light/
LED Flasher is a simple project producing a flashing effect of six LED’s. This project can be used in all areas where you want to draw attention. Hi-glow LED’s providing enough flashing light to attract your attention. Can be used as warning light. Specifications Supply input 12 V @ 35 mA (6 to 15V Dc […]
Disco Lights with IC555
https://www.electronics-lab.com/disco-lights-with-ic555/
This is a simple 555 timer IC circuit that is able to power two strings of LEDs alternative. Disco lights are mostly used in decoration made with colourful LEDs. For begginners, this is a compact circuit using a single chip IC. IC555 is connected here to form a multivibrator. The blinking speed can be easily […]
Anti-Drowsiness Alarm
https://www.electronics-lab.com/anti-drowsiness-alarm/
This reference design is an anti-drowsiness alarm, which aims to keep the drivers alert by disrupting one’s drowse. According to the study by U. S. National Highway Traffic Safety Administration (NHTSA), drowsy driving is the primary contributor of at least 100,000 auto crashes a year. Statistics shows that most crashes caused by drowsy driving occur […]
NE555 timer sparks low-cost voltage-to-frequency converter
https://www.electronics-lab.com/ne555-timer-sparks-low-cost-voltage-to-frequency-converter/
by Gyula Dioszegi @ edn.com: In 1971, Signetics—later Philips—introduced the NE555 timer, and manufacturers are still producing more than 1 billion of them a year. By adding a few components to the NE555, you can build a simple voltage-to-frequency converter for less than 50 cents. The circuit contains a Miller integrator based on a TL071 along […]