Designing an LED Array Circuit for Real-Time Feedback on Exercise Equipment

In summary, the conversation discusses modifying exercise equipment to generate 12v dc with a maximum current of less than 1 amp. The equipment has a standard plug for powering devices and its current generation is properly monitored and displayed. The individual would like to add an array of LEDs to provide real-time feedback to the exerciser, but is unsure how to design the circuit. Suggestions are made to use a transimpedance amplifier and LM3914 or LM3915 IC to control the LED display.
  • #1
Rick Martin
2
0
I've modified a piece of exercise equipment so that it generates 12v dc. Max current is almost certainly less than 1 amp (more than that, and the subject (exerciser) poops out fast). Standard (car lighter) plug allows any appropriate device to be powered. Current generation is being correctly monitored and reported graphically. All that seems to work just fine.

What I'd like to add is an array of LEDs on the equipment itself, to provide real-time feedback/encouragement to the exerciser/subject. Something like 150 ma lights one, 300 ma lights two, 450 ma lights three, etc.

Got absolutely no idea how to design that circuit. Any thoughts?
 
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  • #3
  • #4
Yes, Bob. The LM3914 is the linear version of the LM3915. All depends on if you want linear or log response.
 
  • #5
Thanks, guys! Looks eminently reasonable. Sure appreciate the info.
 

1. What is an LED array to indicate current?

An LED array to indicate current is a group of light emitting diodes (LEDs) that are arranged in a specific pattern or configuration to visually display the amount of electrical current flowing through a circuit or device. Each LED in the array represents a certain range of current, and the more LEDs that are lit up, the higher the current is.

2. How does an LED array indicate current?

An LED array to indicate current works by using a voltage divider circuit, where each LED is connected in parallel with a resistor. As the current flows through the circuit, it creates a voltage drop across the resistor, which causes the corresponding LED to light up. By using different resistor values, the LEDs can be calibrated to light up at specific current levels.

3. What are the benefits of using an LED array to indicate current?

LED arrays offer several benefits compared to traditional methods of current indication, such as analog meters. They are more energy efficient, have a longer lifespan, and provide a more precise and accurate measurement. Additionally, LED arrays can be easily customized and can display multiple readings simultaneously.

4. Can an LED array indicate both AC and DC current?

Yes, an LED array can be designed to indicate both AC and DC current. However, the circuit and resistor values will differ depending on the type of current being measured. For AC current, a diode bridge and different resistor values are used to convert the alternating current to a pulsating direct current, which is then measured by the LED array.

5. How can an LED array indicate current in a safe manner?

To ensure safety when using an LED array to indicate current, it is important to use appropriate resistors and follow proper circuit design principles. It is also recommended to use voltage limiting diodes to protect the LEDs from high voltage spikes. Additionally, it is important to regularly check and calibrate the LED array to ensure accurate readings.

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