Arduino Projects and Circuits
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There is a Lithium Polymer Ion Battery that comes with the Lilypad Development Board from Sparfun. Does anyone know if the battery charges if we plug in the battery to the Lilypad Arduino and connect the Lilypad Arduino using the FTDI at the same time. The.... -
It seems to me like the wire connected to the 5v pin is connected to the + pins of the breadboard. which are connected to nothing. There`s nothing else on the + column. I know this is a basic "google it" question, but probably due to the fact that I don`t.... -
This requires expensive hardware (microphone & amplifier) and some sophisticated audio analyizig on the microcontroller. Even a complete microphone with amplyfier circuit does not provide the desired results (according to the comments on this product) I am.... -
A 5v power supply to act just like a switch. I will be controlling it with an Arduino like described here: You won`t be able to drive it directly from the Arduino pin, as most general purpose relays require at least 150mW to switch which is >30mA @ 5V. You.... -
A circuit using a keypad, a servo and a few LED`s. This was connected to my Arduino Uno. Now I tried putting everything onto a single PCB and thus building my own custom "Arduino" into it. The red LED is supposed to shine and the servo must move to a certain.... -
If I disconnect the ground of the Arduino from the negative terminal of the power supply, current flows through the MOSFET, even when the switch isn`t closed!.. -
A fingerprint door lock, and the only thing that`s stopping me from purchasing the components is knowing if my setup is going to work or not. Is this an acceptable setup For the actual fingerprint reader, I was going to use this one, , which upon receiving.... -
A half bridge setup with strain gages and a INA126 to amplify the voltage. I can read the voltage fine when the lever is bent one way, but when beding the lever in the opposite direction I don`t get any reading. I`m guessing it`s because the voltage is.... -
The circuit is okay (not ideal for quality but it will work), but there`s one small issue if you want to feed the output to your Arduino. As shown, the output will swing below ground (i. e. it will be biased at 0V) and your Arduinos analog input will only.... -
A cat deterrent with an Arduino, something akin to this. I have figured out detection, and now realize that I need to use an ultrasonic transducer to produce the `blast` that I need... -
A device which provides a USB port. If I attach it to a Windows PC it is recognized as a "CP2103 USB to UART Bridge Controller". According to the device documentation, it should communicate in serial format at 38400bps. Since the USB pinout is different from.... -
Read the generic sound level from an Electret Microphone. I`ve seen a number of schematics with NPN transistors, that will provide an inverted output (~5V when quiet, ~0V when loud, linear operation in between). However, I would like non-inverted output.... -
A project with two distance sensors that signal an Arduino to operate a servo motor when an object comes into range. This currently works well, except that the sensors are outputting a relatively high voltage all the time, so I have to set a very high cutoff.... -
Did you check if you actually see the zero crossings on your input pin You might want to write a sketch that toggles the pin13 LED every 50 or 60 or zerocrossings. You should see a visible 1Hz blink. jippie Mar 3 `13 at 11:41 Which input pin did you use for.... -
Using digital IR Receiver Module and digital IR Transmitter Module connected each with different Arduino Uno. How can I transmit data like "1234" to the receiver and display data on LCD This is because most of the example that I found using IR remote code.... -
Control the state (on/off) and direction of two linear actuators that are really just DC motors. It seems easy but the problem is that the linear actuators are each 12VDC and consume 10 amps of current at full load. I bought a 25A external power supply.... -
The emitter is always going to be a few hundred milli volts behind the base voltage (in this type of configuration) and as the base voltage is 5V, depending on how much current is taken by the "switched" circuit" on the emitter, it is more likely to be 4. 5V.... -
An Arduino Uno connected to two IR transmitters and respective receivers. Basically, when one of the receivers detects a beam break, I have a strand of LEDs display a pattern. This all works in principle, but the problem is that when the IR transmitters and.... -
Power a 12v fan using a darlington so I can control the speed from an Arduino. When I wire up as below nothing happens, even though I`m sending a PWM signal: Please draw a proper circuit. Edit your question and hit Ctrl+M, the current image is unreadable..... -
Just a nitpick, you don`t have the Leds in Parallel with the transistor. If you did, the leds would be on when the transistor is off. You have them in parallel going into the transistor. All the transistor sees is n times led current going through it. It.... -
If they have to be both powered from the battery do I need to connect the emitter to the ground of the Arduino AND the battery to stop all the current from flowing through the Arduino ground and get a clean pulse or do I just connect the emitter to the.... -
A scoreboard in the middle of the room, that one will control from backstage. The scoreboard will have two 3-digit numbers, controlled individually. Whenever the score changes, a little irritating sound should. sound. What is the easiest, more efficient and.... -
If you want to build a 7 to 128 demux with 3-to-8 and 4-to-16 demuxes, then put the 3 high bits of your output address into the 3-to-8, and use the outputs of that as the input enable to the individual 4-to-16 demuxes (assuming that it has an enable pin), so.... -
All you need to do is supply a resistor (I used 200 Ohms, with a 3. 3V supply) to the power line, GND it, then connect the data line to one of your digital pins (I used pin #2)". However, the datasheet shows an example circuit with a 100 Ohm resistor.... -
Control a little 5v motor from an external power supply by using the Arduino to trigger a transistor. Like this: Is that at all correct Will it work I want to experiment but I don`t want to break my new toy in the process. The transistor I am using is an.... -
The light is simply blinking instead of dimming. So I used the following software to just glow the bulb without dimming: unsigned int i=1; void setup() { Serial. begin(9600); pinMode(AC_pin, OUTPUT); pinMode(11, OUTPUT); attachInterrupt(0, light, RISING); }.... -
Charge a simple servo that only has + and - pins. Usually I would connect it`s - pin to the ground and + pin to the digital output from Arduino. This works, but the servo turns weakly and can be stopped by hand. If i connect the servo directly to the battery.... -
Designing a circuit that will use a combination of switches and resistors to allow a microcontroller to identify which switch was pressed based on the voltage read and perform a switch-specific action. The design that I`ve come up with involves using a.... -
An Arduino running on 2 or 4 rechargeable NiMH AA batteries. I say 2 because I might boost up the voltage to what`s needed. My problem is that this project will sometimes be plugged in and I would like the batteries to be able to charge during that time.....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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