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28 views

Belt moving around

I need a syringe to move about in a set loop. The 'map' for it to move on is very squiggly, and it needs to move a short distance precisely (to the nearest 0.1mm). How to I do this? Also, I will be ...
0
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0answers
56 views

Arduino Based Solid State Drive [migrated]

I've searched high and low for something to get me on the right track, it's making me think it might not be possible. Basically, I want to create a cheap SSD using Arduino (or another microcontroller ...
0
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0answers
29 views

Questions on RC Truck/Arduino/Endurance [on hold]

I've googled, and searched - nothing too related to my question. I appreciate any help. I want to get an RC Truck (1/18 scale) or something to use as a Chassis - and control via Arduino/Bluetooth. My ...
0
votes
1answer
74 views

How to step down 12v to 5v efficiently

So, I have a wall-wart power supply giving regulated 12v 500mA to a 2.1mm Jack. I'm using this to power a 12v 160mA fan, and an Arduino Pro Mini (at 5V). I understand that the Mini's regulators to ...
0
votes
1answer
40 views

H-bridge problem with TIP122.

I tried to make H-bridge by TIP 122 transistor. I used 9V for a VCC. I used push button to control H-bridge, and it's fine. Then I used Arduino 2560 with two digital pins for driving H-bridge. But the ...
0
votes
3answers
83 views

Sending data from 4 transmitters to 1 receiver without a microcontroller

I am working on a project to wirelessly check whether any of four switches are pressed and I don't want to use a microcontroller on the transmitter side. I have worked with the cheap 434MHz HT12E/D ...
0
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0answers
21 views

Need help with on off switch to power arduino. [migrated]

I am trying to add an on and off power switch to my arduino project. My project is running off a 9v battery and I would like to save as much power as I can. There might be a better why that I don’t ...
3
votes
2answers
147 views

Using arduino code for mass production

I have prototyped a connected object with arduino and I would like to go for mass production, actually just a few hundreds to start. I'm going to design a customed PCB with everything integrated: ...
0
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1answer
26 views

Question about RFID Reader Frequency and RFID Tags

I'm researching about RFID Technology as i'm trying to build a RFID Reader using an Arduino and/or Raspberry Pi which i been trying to do so for a month however with no avail. So i been reading up as ...
0
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0answers
40 views

How to generate the gate voltage for the P-channel transistors for an H-bridge controller

I would like to create an H-bridge out of discrete N and P-channel transistors as a nice demo of the concept for a high school course. The driver is to be an Arduino should that affect your design ...
0
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0answers
3 views

Which components to built remapping keyboard via USB in + out (remapped) [migrated]

I know that it's fairly easy to change the emulate keyboard and mouse by Arduino. But I'm quite specific about the goal I would like to achieve hence I would appreciate if you could advise me which ...
0
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0answers
46 views

Upper values of analog reading of sensor is cut off

We are using a dual element Motion sensor for our project. Here is the link of sensor we are using. Dual element Motion Sensor You can find the datasheet in the same link. This is our circuit ...
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2answers
53 views

Voltage drop when measuring battery capacity

I'm trying to build a battery capacity tester for Li-ion batteries. I made this schematic using Arduino: While bush button is not triggered arduino only shows battery voltage on Serial & when ...
0
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0answers
31 views

multiple RGB LEDS on minimal pwm pins VS current limitions

the theory explained at Hooking up multiple RGB LEDs while using a minimal number of PWM pins on an Arduino? isn't really working with the arduino current limitations mentioned at ...
0
votes
1answer
54 views

How best to power down an Arduino for ~5 minutes at a time?

Reading over the datasheet it appears the longest it can shutdown for is 8s so should I just keep a counter in the loop method that checks if it's run 38 times and then execute the code I want? Would ...
0
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2answers
73 views

Soldering, Chips for Beginners

I am currently running a club for kids (9-11) for Arduino and we are making a robot and are moving on from motor/transistor drivers to half-hbridge (so we can go backwards). The kids are learning to ...
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0answers
5 views

gps skm53 arduino not worcking [migrated]

gps skm53 not return latitude and longitude this code ...
-1
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1answer
37 views

Synchronus Buck Converter

So i am designing a Synchronus Buck converter 12V - 5V with 12 W of power at the output. This means that my output current will be on average 2.4 A. Now for the feedback I am using an Arduino. I will ...
0
votes
2answers
59 views

Unconnected item on circuit diagram

I'm looking to use a CAN Bus shield with my Arduino. The following is a circuit diagram for it: https://www.sparkfun.com/datasheets/DevTools/Arduino/canbus_shield-v12.pdf I am having trouble reading ...
0
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3answers
100 views

Why does a closed circuit with a pull-up resistor output “0”?

I have a switch setup with a pull-up resistor. With the switch open I get a "1" or HIGH output and with the switch closed I get a "0" or LOW output. I understand why I am getting the "1" with it open ...
0
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0answers
7 views

Arduino Dimmer Shield Schematics Interpretation [migrated]

I've read so much about Thyristors, Triacs and Rectifiers on the last days that I'm almost undertanding my schematic, but I'm not there yet - I need some help. Overview: I'm making a home automation ...
0
votes
1answer
85 views

ADXL345 Arduino UNO Activity Inactivity interrupt

I have DATA_READY, Activity and Inactivity interrupts mapped from INT1 to INT0 on the arduino. DATA_READY works fine, the problem is Activity and Inactivity are always set to 0 in the INT_SOURCE ...
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1answer
44 views

I2C level converter stops bus [on hold]

I am trying to get an lcd 16x2 with PCF8574 I2C working with my arduino due. If i connect my lcd with 3.3v (backlight doesn't work, led from the PCF8574 lights up) and upload the i2c scanner sketch ...
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0answers
33 views

Read bipolar torque sensor with Arduino

I have connected a bipolar torque sensor to an Arduino and I can without problems read the data when turning the sensor clockwise. The problem is, when I want to measure in the other direction nothing ...
0
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0answers
45 views

Programing other Atmel ARM chips using Arduino [migrated]

Ok, i know professionals generally hate Arduinos, but I would like to know if it would be possible to program Atmel ARM chips using the Arduino IDE. By which I mean, not needing to modify the source ...
1
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0answers
138 views

NTC Thermistor Resistance Calculation for circuit using Wheatstone bridge, Op Amp & Arduino

I'm trying to work out the formula for thermistor resistance when using Wheatstone bridge/op amp circuit as opposed to a voltage divider circuit. I know for a voltage divider the \$R_t\$ value is ...
0
votes
1answer
56 views

Understanding how to use an accelerometer to detect vehicle collisions

Objective: To use an accelerometer to detect where on a vehicle a crash occurred (e.g. impact occurred on the passenger side.). Parts: Arduino Uno and LSM3030DLHC accelerometer Background: I've been ...
0
votes
3answers
55 views

Parallel LED strings of different colors and Arduino

I need to use 7 strings of led, each one of a different color. I will control each string using a Arduino and the BC 337 Transistor. The string will be connected to a 12V power supply. I have read ...
0
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0answers
32 views

Acheiving high data Rate via Xbee communication

We are developing a real time monitoring system for activity detection in Smart Buildings. We are using motion sensors and noise sensors to detect various activities in a Building. We are using Xbee ...
14
votes
4answers
2k views

Are solder bridges on chips always bad?

I just bought my Arduino Ethernet shield – a knock-off one for $10 instead of $60. I connected it up, but it doesn’t work – LEDs light up but do not blink, and no ethernet link is established ...
1
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1answer
39 views

Completing circuits with transistors and arduino

Hello and thanks to anyone who helps. I am trying to create a test bench for a control board we commonly work on at our business. One control board has 11 pins that a ribbon cable would be connected ...
0
votes
1answer
47 views

PWM or Phase Control Dimming?

I want to dim a lamp around 70W or more using arduino. I have found two ways for doing that. The first one is to make a circuit that "cuts" the sine wave and produce the dimming effect (link). The ...
0
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1answer
79 views

Circuit for flashing led strips controlled by Arduino Nano

I'm building a project to flash three concentric rings of LEDs in sequence to give the effect of light moving from the centre to the edge. The circumference of each loop is based on an even number of ...
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0answers
47 views

Desktop Vaporizer

I'm planning on building a non-portable vaporizer. The question is how to deliver desired power (0-20 V, 0-400 W) controlled by Arduino (or any other board) through 510 connector to the atomizer ...
-2
votes
1answer
67 views

How would I connect a GSM SIM900A v3.1 with Arduino UNO?

How would I connect a GSM SIM900A module with Ardunio Uno This is an image of it: Here is the datasheet
0
votes
1answer
31 views

SIM900 and Phone Numbers

How do I add a phone number to the SIM900? Can I add a phone number to the SIM900? Assuming I can, would I send the phone number through the AT Commands or the actual SIM card? I don't know how to ...
0
votes
2answers
72 views

AVR Rapid Fire Mod… I hit a wall and need some help

Title says it; I'm making a rapid fire mod chip with the 328p family of chips right now (I'm going to scale down to whatever the smallest chip is that will safely hold the final software). I'm a fan ...
4
votes
1answer
75 views

Puzzling behavior of op amp circuit

I'm trying to build a circuit that can amplify 5-20 mV DC voltage to around 3-5V. To achieve this, I'm using a standard non-inverting op-amp circuit, with gain ...
-2
votes
1answer
54 views

DC motor working on Arduino but not Attiny with batteries [duplicate]

I have a simple working circuit to control a DC motor with an Arduino as indicated in the Arduino examples. For instance, ...
2
votes
1answer
63 views

How to write a code to create multilevel waveform using arduino

I need to make a 5-level multilevel(staircase) waveform for my major project from an arduino. how can i get 24 V supply form. I tried to change pulse width by PWM using analogWrite(),but it can ...
3
votes
3answers
261 views

Control Power Resistor with MOSFET

I am making a temperature control system using an Arduino. However, I have a problem with controlling a power resistor (which is used as a heater). I was suggested to use a MOSFET to control it. ...
0
votes
2answers
39 views

Converting headphone signals into MP3 using Arduino

For my project, I am looking for a way to take headphone audio signals (from TVs and other appliances), convert them into MP3 and send them over WiFi to a remote device (PC or other) using Arduino UNO ...
0
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0answers
34 views

Expandable power supply for multiple components with different power requirements

Suppose an Arduino based project involves multiple sensors and actuators, each with its own power requirements, what are the ways to build single power supply for it ? Further is it possible to make ...
0
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0answers
53 views

Arduino-like boards with other microcontrollers [migrated]

Are there any Arduino-like board designs that are NOT using an AVR chip, but perhaps a chip like the Z80 or the 6502?
2
votes
1answer
53 views

volt management for a big circuits (mother board if you will)

I've to have a 2 Ardunio and 1 Netduino in a board, they are connected to +100 component. All I need is less than 5A so I bought a 12v 6A power supply and need to ask some questions so I avoid doing ...
0
votes
1answer
102 views

ADXL345 Arduino UNO data_ready interrupt

I would like the sensor values to be updated each 10ms(100Hz) and then run the algorithm and repeat the same process. However, after timing the algorithm it is taking only 2ms, I think the data_ready ...
0
votes
1answer
86 views

Moving a small pin up and down using <12v

Hobbyist here. I'd like to move a pin up and down using <12v. How can I do that. I don't wanna do it the mechanical way as I have three of them. my first option is using a servo in vertical way ...
0
votes
1answer
57 views

HX711 amplifier

I have one of the HX711 ADC devices that I want to use for a weighing application. I've fitted it to a breadboard and used demo firmware to poll the chip for readings. The behaviour is as follows: The ...
0
votes
0answers
14 views

Reading amr file using cooking hacks shield

I am using cooking hacks 3g+gps shield by using it, I am recording an amr file and storing it in SD card. Now,I want to read amr file stored in sd card and convert it into byte array and send via ...
0
votes
1answer
78 views

Linked grounds produce “noise” on Arduino's 5V lines

I'm using an Arduino to realize two "simple" tasks. The Arduino shall receive messages by an 433MHz receiver and send them via ESP8266/ESP-01 to a server. The schematic/wiring plan is attached below. ...