Hi Buya, For this measurement the digital input/output terminal of the DrDAQ must be used, which gives a PPS measurement: pulses per second, or Hz. But I am of the opinion it is not possible to measure the speed of a wheelchair with the DrDAQ and Picolog because with these it is possible to reliably...

Hi Buya,

Will post info for your questions next week. Bye.

Glovisol

Hi Buya, I am glad the combination Hall sensor - DrDAQ works fine. In order to advise you, I need to know where and how you wish to have the wheelchair speed display, as follows: 1) Is the speed display/recording to take place on the wheelchair itself? 2) In this case is it possible to use a laptop ...

BUFFER - ERRATA CORRIGE Buffer schematic Ver. 3.2 of 25/02/2015 - new schematic attached. Corrected denominations of AUTODETECT resistors. NOTE / THIS POST EDITED ON 18/11/2015 and buffer schematic has been replaced with Ver. 3.3 to correct diode D6, which was previously wrongly placed - APOLOGIES!!

Hi Buya,

I enclose schematic + text for the Hamlin 55100 Hall Sensor application to the DrDAQ. Hope it helps.

Glovisol

Hi Buya, Please post the model of the Hall sensor, or download the spec sheet. I then shall show you how to connect it. You can measure frequency both by Picolog and by Picoscope. If you use Picolog you can show on the PC a graph of Frequency Vs. time and you can also automatically convert Frequency...

24/2/2015

Please check the Universal Buffer Topic to see amended schematic Ver. 3.0

BUFFER - ERRATA CORRIGE

There are errors in the list of connections of S1, schematic right side. The revised buffer schematic, Ver. 3.0 / 24/2/2015 is enclosed. More apologies.

Hi Shiv, The DrDAQ can indeed be used for conductivity measurements by using the 3 available EXT. channels as data acquisition in Picolog, plus the Resistance channel as an overall check. EXT. 1 CHANNEL logs sample temperature measured with an LM35, or other miniature sensor. EXT. 2 CHANNEL logs vol...

Hi Shiv, The DrDAQ, with the last version of PICOLOG, VERSION r5_24_2 , can measure resistance in the range 1kOHm - 1 MOhm with 0.5% precision, once the ad hoc corrections have been put in place. See "Problems with resistance measurement of the USB DrDAQ" in the USB DrDAQ Forum. So, in principle thi...

ERRATA CORRIGE There is a mistake in the text of the 100 - 1000 KOhm scaling equation previously presented, although equations shown in the EXCEL file are correct. Correct equations in improved form following the PICOLOG rule are shown below. 1 - 10 KOhm range: (0.9975* X ) - 0.3843 10 - 100 KOhm r...

See replies to the following topic:

DrDAQ Resistance measurement problems

Hi Karunen,

SUPER!!

Thank you,

Glovisol

ERRATA CORRIGE THE NEW PICOLOG VERSION r5_24_2 WORKS JUST FINE! Please amend the following sentence: The above data can be used to compile a Reference (scaling) Table in Picolog, or to compile a Reference (scaling)Table in a .DDS File, once the measurement range (e.g. min. and max. values) has been...

THE NEW PICOLOG VERSION r5_24_2 WORKS JUST FINE! I have taken the time to collect measurement data on the Resistance channel of the DrDAQ, after downloading the new version of PICOLOG. Operating conditions were as follows: - USB Voltage to DrDAQ: 5.06V. - Sampling interval: 1 Sec. (smaller sampling...