Search found 10 matches

by M.Yasser
Tue Sep 11, 2012 5:18 pm
Forum: USB PC Data Loggers
Topic: USB DrDAQ PWM
Replies: 6
Views: 4516

Re: USB DrDAQ PWM

no problem.. thanks any way.
by M.Yasser
Fri Sep 07, 2012 11:19 am
Forum: USB PC Data Loggers
Topic: USB DrDAQ PWM
Replies: 6
Views: 4516

Re: USB DrDAQ PWM

Hi Pico Stuart,
Thank you for your reply. You gave me a nice inexpensive solution.
Although I wanted to understand the o/p circuitry of DrDAQ.
Thanks again.
Yasser
by M.Yasser
Wed Sep 05, 2012 7:28 pm
Forum: USB PC Data Loggers
Topic: USB DrDAQ PWM
Replies: 6
Views: 4516

Re: USB DrDAQ PWM

Hi,
PWM supposed to be a digital signal (on/off) not an analog signal isn’t it?
Analog signals need amplifier if they are small signals; digital signals need a level converter.
I need to know the output circuitry of USB DrDAQ to apply a suitable conversion circuit to it.
Regards.
Yasser
by M.Yasser
Sat Aug 25, 2012 12:09 pm
Forum: USB PC Data Loggers
Topic: USB DrDAQ PWM
Replies: 6
Views: 4516

USB DrDAQ PWM

Hi, I'm trying to use PWM1 and PWM2 of the USB DrDAQ writing my own programs using the SDK. To be able to control motors using H-bridges, I need to raise the voltage level of the PWM signal from about the 0-2V to meet the logic level 0-5V of the H-bridges. so I need some information about the o/p ci...
by M.Yasser
Thu Aug 23, 2012 8:51 am
Forum: Sensors
Topic: LM35 Temperature sensor
Replies: 3
Views: 6634

Re: LM35 Temperature sensor

Helo Ziko, helo Pete, Thanks for the useful replies. try using the scope input instead of the external input, it should work like this. This is a reasonable solution since the input impedance of the scope is hi. Unfortunately DrDAQ has only one channel and I need to measure three Lm35 simultaneously...
by M.Yasser
Sun Aug 19, 2012 7:15 am
Forum: Sensors
Topic: IR Remote Sensor/Decoder?
Replies: 2
Views: 5096

Re: IR Remote Sensor/Decoder?

I wonder if we can make the DrDAQ give out a captured wave and modulate it by 38KHz to get it to control devices????? Hi, I think if we make use the USB DrDAQ SDK we can do the job. 1.Write a program using MS VC++ express (free to download from MS site) to record each button press to some files. 2....
by M.Yasser
Sun Aug 19, 2012 6:38 am
Forum: Sensors
Topic: Water level/Soil Moisture Sensor
Replies: 3
Views: 7271

Re: Water level/Soil Moisture Sensor

Hi Pete,
How did you choose the values of the RC LPF (R1, C3)?
Is the capacitor C4 (100nF) necessary for the auto-scenes?
Regards.
by M.Yasser
Sun Aug 19, 2012 6:14 am
Forum: Sensors
Topic: LM35 Temperature sensor
Replies: 3
Views: 6634

LM35 Temperature sensor

Hi, I’m trying to connect three LM35 temperature sensors to my USB DrDAQ external ports (Ext1, Ext2 and Ext3). These sensors are powered from +5v out of DrDAQ. The readings of the sensors when connected to DrDAQ are wrong (24 C becomes 120 C), when I disconnect the output of the sensor from DrDAQ th...
by M.Yasser
Fri Oct 21, 2011 3:27 pm
Forum: MATLAB
Topic: Matlab
Replies: 17
Views: 19094

Re: Matlab

Hello Hitesh,
I’ll do some experiments and examine your code...
Thanks a lot. :)
by M.Yasser
Sun Oct 16, 2011 2:29 pm
Forum: MATLAB
Topic: Matlab
Replies: 17
Views: 19094

Re: Matlab

Hello,
Do you have examples of programs in Matlab for USB DrDAQ or original DrDAQ ?
Regards.