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0
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0answers
41 views
STM32 ADC sampling problem
I'm using the STM32F2 microcontroller, and have a weird problem with the ADC. Seems like the ADC sampling circuit needs a reset to take a sample, as the ADC value quickly drops after the reset. For ...
0
votes
1answer
225 views
I am getting 90 volts in one line, 140 in the other and 20 in my common line. Why does this happen?
These overhead lines run to my farm yard cattle water trough.They say it is because I have a loose connection somewhere in my common line. Why does this cause the volt fluctuation in all of the lines?
...
0
votes
1answer
52 views
I would like to ask if my answer to this simple circuit is correct
The problem is to find the values of Vx and i3. I was reviewing DC using KVL and KCL and I would like to check if I got the answers right!
1
vote
1answer
61 views
Need Help Connecting External ADC to MEGA 2560
I heard you all were the experts so I thought I'd ask here. I'm fairly new to all of this as well. So I'm working on this project and I have to connect an external ADC, the TLV571, to an Arduino MEGA ...
1
vote
0answers
43 views
1
vote
2answers
320 views
Basic PIC circuit is not working
I have just begun in the world of micro-controllers, and the first micro-controller. I chose to work with was the PIC from Microchip. The PIC I am using is the PIC16F877A. I am using MPLAP IDE and ...
3
votes
3answers
311 views
Xbee Transmitting garbage characters
We tried to make two Xbees communicate with each other. One Xbee module(configured as transmitter) is connected to one PC (PC1), and the other Xbee module(configured as receiver) is connected to ...
0
votes
1answer
401 views
Arduino will not power on with external power supply
I have a 5V and 12V Super rechargeable Li-ion Battery, and I'm trying to power my arduino with it. It's an emergency because tomorrow I have to present a robot and it doesn't work.
My Arduino is an ...
0
votes
1answer
312 views
Problem with Arduino and 2 Sharp IR sensors
I have 1 Arduino and 2 IR Sharp GP2Y0A02YK0F proximity sensors, I connected 1 sensor, with mounted capacitors between GND and VCC (100nf, 10000nf)
Everything is fine, I have good values, but when I ...
-1
votes
3answers
178 views
How to by pass RF
I have built a kit set vehicle detector which has the coil wound around a steel former and buried into a driveway or road. From this coil it connects to the control gear via a three core screened ...
1
vote
0answers
513 views
Level shifting with BSS138 - weird values
I need to connect 5V and 3.3V devices via I2C as follows:
I've connected 3.3V and 5V pull-ups and try to measure voltage. There is 5V on HV and TX_HV but 4,7V on LV / TX_LV.
Putting TX to LOW ...
2
votes
2answers
187 views
PIC12F Working Differently Than Programmed
I'm trying to drive a shift register using a PIC12F683, so I wrote this code for a simple test:
...
5
votes
3answers
622 views
Arduino uno - Servo
Im trying to control two servos at once using Arduino UNO and Arduino Motor Shield. My servos are modified, so that they can work with constant movement. When I send the first order ...
4
votes
2answers
2k views
Beginner information related to constant current dummy loads
I am beginning an electronics design project to build a constant current load to drive testings for batteries, bench power supplies etc. I have been hard trying to locate some black-on-white ...
7
votes
4answers
9k views
Solder won't stick
I am trying to make an LCD shield from my Arduino and am having problems trying to got the solder to stick to the Freetronics protoshield PCB. I have cleaned it as best I can.
I am using a decent ...
4
votes
3answers
848 views
Proper behavior for USB and +5V
I have a batch of Sanguino 1.3a RepRap boards, with the following "bug" listed:
The USB 5V VBUS is connected to the output of the 5V regulator. This is bad for the regulator and bad for the PC. ...
0
votes
0answers
252 views
MicroSD SPI mode read/write problem after some addresses
I am work with micro SD cards in SPI mode , and met a strange problem . Some microsd cards do not want to read/write after some special addresses.
MicroSD 8GB stop to read/write after block 0x7670 ...
0
votes
1answer
353 views
TFT Monitor output is blurry and weird looking - but OSD works fine
I don't really know how to describe what happened to my monitor, but I made a small video here: http://www.youtube.com/watch?v=Gjh5crE-Zx4
In summary, the output of the monitor is all garbled, but ...
0
votes
1answer
489 views
System Generator: Problems with CORDIC block at getting the bitstream file
I don´t get to get the bitstream file. I have an several errors when I try to generate the bitstream file.
The error
I have this error message from the file call 'xflow.results':
ERROR:Par:228 - ...
2
votes
1answer
2k views
V-control broken on old (CRT) TV-Set?
I found a TV-Set in a dumpster, and checked if it's still working.
Indeed it is somewhat functional, but the picture is distorted:
(screenshot of the TV)
Depending how bright the picture is, it ...
6
votes
2answers
1k views
GPS Units - Weather Balloon
I have a problem concerning GPS units. I have been studying on a project for a weather balloon which will go about 30 - 40km up. Now I do know that some GPS units have a limit on how high they can ...
3
votes
2answers
599 views
PIC24H SPI Problems
I am trying to setup the SPI1 port on my PIC24HJ206GP256 micro. I have set the SPI1CON1 control register with 0x0020, the SPI1STAT control register with 0x8000 (I.E. turn on the SPIEN) and SPI1CON2 = ...
4
votes
1answer
823 views
BusPirate and SPI Reading Memory
I'm trying to learn about SPI and I have a old bluetooth headset with SPI solder points on it. I've already soldered the corresponding [MISO,MOSI,CS,CLK] pins and connected them to the buspirate ...
