The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. It’s a capable little PC which can be used for many of the things that your desktop PC does, like spreadsheets, word-processing and games. It also plays high-definition video. The design is based around a ...
-2
votes
1answer
28 views
ADC ic's for SPI protocol [on hold]
I want to know what are the ADC Ic's is suitable for SPI protocol? because i cant find MCP3008 ic in shops? No one having this IC.
Thanks.
0
votes
1answer
44 views
Darlington does not switch
I have a darlington Transistor circuit. Like in the schematic i attached. When i power up the 3V3 from my raspberry, the led is not on. When Doing Danke same with 12v instead of 5v, it Works ...
0
votes
1answer
32 views
DH-11 Sensor on a Raspberry Pi & Arduino
I am trying to make my DH-11 sensor work on my raspberry pi but I have not succeeded after several attempts. I followed the following tutorial from Adafruit:
...
0
votes
0answers
20 views
Creating a pulse when the circuit opened and closed [duplicate]
I would like to send wake up and halt signal to a linux board. I just want simulate the power button on the board so I will replace it with a circuit.
So: When I the car's ignition line is on it has ...
0
votes
0answers
7 views
Can I connect my Innolux screen to Raspberry Pi 2 using TFP401 HDMI/DVI Decoder to 40-Pin TTL Breakout
Setup
Raspberry Pi 2
TFP401 HDMI/DVI Decoder to 40-Pin TTL Breakout - Without Touch
Innolux 5.6 LCM aSi TFT type LCD
I am hoping to be able to connect the Pi2 to the Driver using a small HDMI ...
-1
votes
0answers
13 views
entry level opensource RFID development kit to be used with Raspberry PI [closed]
I am looking for an entry level opensource RFID development kit to be used with Raspberry PI.
I want to use it to read a RFID chip. Any RFID chip will do.
So which SDKs are available
And which ...
-2
votes
0answers
30 views
bluetooth camera module connected to phone [closed]
hello i'm looking to make a small camera which is connected to an iPhone/Android phone.
at this point the most practical solution is to use a raspberry pi 2 + the camera module and a Bluetooth ...
1
vote
1answer
50 views
Frequency Counting on a Raspberry PI
I am trying to count a square wave on a Raspberry PI.
I tried a variety of approaches:
http://abyz.co.uk/rpi/pigpio/examples.html (Freq counter 1 and 2)
...
1
vote
1answer
48 views
Voltage shift from 3.3V to 12V
I'd like to use MX-FS-03V 433MHz transmitter together with a Raspberry Pi (RPi).
The Raspberry Pi's outputs have 3.3V, but the MX-FS-03V operates on 3.5-12V (the higher the voltage the higher the ...
0
votes
3answers
81 views
Voltage shift from 5V to 3.3V
I'd like to use MX-05V 433MHz receiver together with a Raspberry Pi.
The MX-05V operates on 5V, but the Raspberry Pi's inputs only allow 3.3V.
So i need to shift the RX data output level from 5V to ...
0
votes
2answers
46 views
Solderless headers?
Where can I find solderless headers suitable for a solderless breadboard.? This is for a raspberry pi project I'm working on which requires the mounting of an LCD screen. I have explored the ...
1
vote
2answers
142 views
Portable Batteries for the Raspberry Pi
I am building a project involving a Raspberry Pi.
It is known that the RPi runs around an average of 700mA of current and my project would probably need a little over 1A of current due to attached ...
2
votes
2answers
135 views
Controlling 10 high power LED with a Raspberry Pi
I'm trying to figure out how to control 10 Luxeon Rebel LED (700mA) from a Raspberry Pi. I want to be able to turn them on and off from code, but I don't need to have two or more LEDs turned on at ...
0
votes
0answers
46 views
TC358743XBG HDMI to CSI-2 Board
I've got a project in which I have video output from a camera which I can have in either video out or HDMI out. This signal, then, is to be sent to a Raspberry Pi to be used in a computer vision ...
0
votes
1answer
42 views
Xbee Serial communication with RaspberryPi - In Lua
We are working with Mihini for an IoT project. Here we have to communicate via Xbee with sensor nodes and coordinator(RaspberryPi) . Mihini doesn't seem to have any modules particular for Xbee ...
0
votes
2answers
65 views
MCP3008 alternative
I have some analog devices like LDR, temperature sensors, and other sensors and I want to use the readings of these sensors in my raspberry pi B+ , for that I need an ADC , to convert the analog ...
-1
votes
1answer
47 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 ...
2
votes
1answer
102 views
Understanding a SPI command sheet
I am interested in learning more about how SPI works in general, but with the raspberry pi and py-spidev library in mind. I am very technically savvy, although not so much on the EE side of things.
I ...
3
votes
2answers
507 views
How long will a battery last based on these numbers
Hi I asked this question on SU but seemed to have gotten into a bit of trouble, I was referenced here.
I am getting into doing hardware build based on things like microcontrollers and ...
0
votes
0answers
15 views
Assigning a Public IP for RaspberryPi in local area wired network [migrated]
We are trying to configure RaspberryPi with public IP (192.248.10.71) in local area wired network.
This is the network configuration in /etc/network/interfaces,
...
0
votes
0answers
22 views
New Haven display On Raspberry Pi (NHD-C0220)
I'm here because I don't have experience connecting / wiring i2c devices to raspberry. I need to know how the correct way to wire this display to the gpio connector. Right now it's connected, but ...
0
votes
3answers
61 views
How does digital pullups work?
I have lame question. How does digital pullups work? I'm asking because I don't understand DHT11 driver code.
Sample code:
...
1
vote
0answers
68 views
How do I connect a photodiode to a GPIO?
I'm trying to read serial data emitted through an IR led with a Raspberry Pi using an IR photodiode, but I'm not sure about the correct way to hook it up.
Unfortunately I don't have a part number for ...
1
vote
1answer
72 views
Does Ground Voltage Need Lowered As Well?
I am dividing voltage of a 9V battery to 3V for a Rasperry Pi GPIO. I have the ground connected to the end of the resistors, so it is back to 9V when I connect it to the Pi's ground pin. Is it ok to ...
0
votes
0answers
66 views
Building a UPS for Raspberry-Pi
I am trying to build a 5V/2A uninterrupted power supply (UPS) for my rPi B+ using LM7805 and some phone batteries (3.8V/0.5A and 3.7V/2A) or any of the 6 pcs 18650 batteries (3.7V/2A) that I have ...
1
vote
1answer
35 views
problem with LED matrix and raspberry pi
I have a raspberry pi model B+ , and an 8x8 LED matrix(single colored) , so I connected 8 GPIO pins to the 8 row pins of the matrix and another 8 GPIO pins to the 8 colomn pins. Note that I am pretty ...
0
votes
3answers
80 views
(Beginner) Type of (NPN?) transistor to use for RasPi
I'm new to EE. I burned out a Raspberry Pi by running an electric motor directly from its GPIO pins, and then I learned about transistors. I now have another RasPi, but I'm not sure what transistors ...
0
votes
0answers
47 views
RFID card reader : wiegand 26 bits but UID tag 40 bits?
I am working on a project of access control with a Raspberry Pi. I want to buy a RFID card reader (125 khz) and tags.
After a lot of research on the web, I found out that the most common connection ...
0
votes
0answers
24 views
What are the main differences between 4n25 and SFH6156-2T optocouplers?
I'm looking for a 4 pin surface mount equivalent to a 4n25 optocoupler. I'm really not sure what to look for when comparing the data sheets of each optocoupler and I want to try avoid purchasing the ...
1
vote
1answer
110 views
Connect lots sensors (more than 10, mostly accelerometers) to Raspberry Pi by using slaved Arduino solution
I am a programmer but quite new to electronics.
I am trying to connect more than 16 sensors into a RaspberryPi for analysis, because I'm mainly focusing on computing science's machine learning ...
0
votes
1answer
72 views
XY-MK-5V suddenly stops working
I have a situation that just baffles me here...
I bought these cheap XY-MK-5V RF receivers with FS1000A transmitters. I fitted the receiver to an Arduino UNO connected to an 8-channel relay board, ...
0
votes
1answer
82 views
How to communicate 'rawly' with an HD44780 compatible LCD?
I have a HD44780 compatible lcd display (QC1602A). I did a lot of research and found some helpful things, but none of then seemed to really have worked.
I'm not using any lcd library (C), only the ...
-6
votes
2answers
59 views
Powering a rpi and accessory of a 9v battery [closed]
We are trying to use a raspberry pi to record the current going through a dc circuit. The circuit we are trying to measure the current in is powered by a car battery. We have no idea how to record the ...
1
vote
2answers
105 views
Is a relay with a 20 amp rating enough to handle the current from a residential hot water heater?
In Israel the houses usually have a hot water cylinder on the roof of the building which is attached to a solar water heating unit, but which also is connected to an electric heating element which is ...
0
votes
1answer
91 views
Connecting pins of Raspberry Pi GPIO in series in order to turn up the voltage
It's unorthodox and probably not recommended by anyone but, for my project of driving a relay only with scrap parts and on the cheap, I managed to get a 12v relay, but, the GPIO ports on the RPi only ...
1
vote
2answers
114 views
Power-Supply “Combination”: Solar for voltage + Battery for current
I'm rather new to circuits & DIY electronics, but am thoroughly enjoying tinkering with my new RaspberryPi and assorted components. I'm trying to power the device using a few simple solar panels I ...
0
votes
1answer
54 views
How to remove GPIO ribbon from raspberry pi
This is basically it. I got my new raspberry pi and I got a GPIO ribbon to connect it from the raspberry's GPIO's to a breadboard. Now I am trying to remove the ribbon from the raspberry by just ...
1
vote
0answers
34 views
Controlling Raspberry Pi GPIO using Javascript [closed]
I am familiarizing myself with the GPIO pins on the Raspberry pi and was wondering what the easiest way to control them would be using HTML and javascript over a webpage. My intent is to have a button ...
1
vote
1answer
71 views
Motor speed control mosfet
I have a Raspberry Pi and I want it to control DC motor speed. I make the pi output 3x3,3V for controlling the speed. I need circuit that works like this; when one output gives 3,3V motor have 6V, ...
1
vote
1answer
63 views
Raspberry Pi vs BeagleBone torrentbox [closed]
I'm planning to make an always on torrentbox, I get my internet from a 4g usb dongle modem, but I've very limited experience with such boards. From what I read on the internet, it seems BeagleBone is ...
0
votes
1answer
122 views
multi channel ac dimmer for arduino
I have been looking for a simple ac dimmer circuit to use with my arduino and/or raspberry pi. I have used the TLC 5940 PWM Driver before just to control LEDs and I wanted to adapt this to controlling ...
0
votes
0answers
48 views
Programmatically short GPIO pins Raspberry Pi
For a hobby I'm working on a project connecting a RF remote to the raspberry pi.
When I press a button, pin 13 and 14 are shorted on the MCU.
When I put a jumper cable between the pins, the remote ...
0
votes
2answers
85 views
nMOSFET not turning off properly using RPi GPIO pins
I have an N-Channel MOSFET (model: FQP30N06L) which I tried hooking up the Gate connector to a RaspberryPi GPIO pin (3.3v, also tried a always-on 5v).
The Source connector connects to a wall-mounted ...
0
votes
0answers
47 views
Strange behavior Pin to GND
This morning I was trying to do some electronic engineering as a hobby.
A few weeks ago I bought a wireless outlet with an RF remote. Right now I'm trying to connect the buttons of the RF remote to a ...
0
votes
1answer
106 views
RaspberryPi + TowardPro MG996R DIGI HI TORQUE +PWM
I am trying to control this servo from a RaspberryPi.
https://skippy.org.uk/wp-content/uploads/MG996R_Tower-Pro.pdf
I sort of figured out that a servo needs a specific pulse for a specific degree.
...
1
vote
1answer
113 views
Serial Link Between 3.3V devices
I have an RPi and a freescale FRDM-KL25z controller which will talk over serial protocol. I'm using the pyserial library on the pi:
...
1
vote
1answer
102 views
Output Units of Soil Moisture Sensor
I have an Octopus Soil Moisture Sensor connected to a Rasberry Pi through an MCP3008 ADC chip. The sensor is working correctly, but I have no idea what the reading values mean.
I say its working ...
1
vote
5answers
200 views
Best way to get 256 io pins?
I'm connecting to an arduino or raspberry pi and would like to have 256 io pins. I found a 16bit io expander which has 8 unique addresses for 128 but that's the max I can do on i2c. Any other thoughts ...
2
votes
3answers
127 views
Reset the raspberry pi with a relay
I'm going to use my Rasp as a GPS tracking and it should be running even if the car is off; however, I don't want run out the car battery.
To make it happens I added a battery controller ...
0
votes
0answers
40 views
Can I link Ethernet chips on PCB? [duplicate]
I read up on the Raspberry Pi Compute unit and wanted to link a hand full for networking. Unfortunately, they do not come with native Ethernet, but USB. So I was thinking of linking each compute ...
