Post Created date
Ideas for a good sensor - "plummet" / "waterl
A couple of possibilities for solving this problem come to mind. The expensive method would be an ordinary target type spirit level and an industrial camera connected to a control...
Saturday, 23 July 2011 - 18:26
Using an H-Bridge to switch 4 LED's
The ULN2064B from ST is a quad darlington transistor array designed to work from 5v logic inputs and can sink up to 1.5A per transistor. This might meet your needs.
Saturday, 23 July 2011 - 17:57
What's inside this liquid sensor?
If it is using resistance between the probes, then it would not trigger when submerged in a non conductive liquid like mineral oil.
Thursday, 23 June 2011 - 01:15
Relay Question
The other question I'd be asking is how much current is the load drawing? The Good relay is designed to handle 2A on the contacts, while the bad relay can only handle 1A. Is there...
Monday, 20 June 2011 - 16:16
Power Requirement
Looking over the schematics for the board, I see it has an on board voltage regulator. When powered from the USB port, the port provides the power for the CPU, but not for the...
Sunday, 19 June 2011 - 22:13
IR questione
This circuit doesn't make a whole lot of sense to me, in a number of places. the SEN-00241 detector is a transistor, not a diode as shown in the schematic. The output of the...
Wednesday, 15 June 2011 - 19:26
schematic for sim300 is this OK
The manufacturer recommends a 100uf low ESR capacitor from the VBAT pins to ground, placed as close to the sim300 as possible. Either use a bunch of multi-layer ceramic capacitors...
Wednesday, 15 June 2011 - 18:31
I don't know which chip you're using, or which pin, but if the pin can be used as an analog input, even for a comparator, set the pin to analog in any time the IR module is...
Saturday, 4 June 2011 - 20:58
Should this shift register work?
Try replacing the 47uF caps with 0.1uF ceramic caps. There is probably some very fast transients on the +5v power that the '595s will respond to, but that won't show up on a scope...
Thursday, 2 June 2011 - 01:19
Boosting the peek current of a battery by super capacitors
First of all, what battery type are you using? 12 volt lead acid batteries have an internal resistance of something on the order of 50 milliohms. A 24 volt battery consisting of...
Friday, 29 April 2011 - 21:06
Proximity Sensing
Those fake rocks on the climbing wall ar all held in place by bolts. Would a strain gauge on the mounting bolt be enough to detect someone holding or standing on it? Just a...
Tuesday, 29 March 2011 - 20:07
Quote:Are you using a level shifter for rs232?--No That would be the problem right there. the PC serial port uses RS232 voltage levels, which require a minimum of +3v and -3v for...
Wednesday, 23 March 2011 - 19:09