Search found 104 matches

by marcovansteen
Mon Mar 21, 2016 8:49 am
Forum: Projects
Topic: LED and Accelerometer Project Help
Replies: 1
Views: 395

Re: LED and Accelerometer Project Help

Don't give up! Take time to learn Arduino: http://arduino.cc/en/Reference/HomePage Sorry, there is no substitute to understanding about what you're doing. Did you check: http://www.instructables.com/id/Simple-Easy-and-Cheap-DIY-Pedometer-with-Arduino/ If you try to change that sketch to control an R...
by marcovansteen
Mon Feb 22, 2016 8:42 am
Forum: Projects
Topic: Pricing of bulk production of circuit board
Replies: 2
Views: 337

Re: Pricing of bulk production of circuit board

Did you try to find prices at sites like digikey.com, rs-components.com and pcbway.com ? GPS and GSM modules, especially if they need to be always on, use quite some power. Tiny solar panels provide only very small amounts of power. If you need small and cheap than probably you will have to turn off...
by marcovansteen
Thu Jan 21, 2016 5:21 am
Forum: Projects
Topic: Need help finding a rain sensor
Replies: 5
Views: 602

Re: Need help finding a rain sensor

Why not design and 3D print something yourself? All you need is a collecting surface, and a small cup on a lever, with a tiny counterweight.
Use a proximity sensor to detect the tipping. https://www.sparkfun.com/products/242
by marcovansteen
Wed Dec 16, 2015 5:49 am
Forum: Projects
Topic: Press sensor around the object
Replies: 1
Views: 268

Re: Press sensor around the object

Nice idea, indeed it is quite hard to make. Possible alternative: find a flexible hose of (silicone) rubber, 5 mm diameter (or so), and glue it to a pressure sensor. The pressure will increase when bumped. Of course, close the hose at the end. Sensor: http://www.digikey.com/product-detail/en/MPX2300...
by marcovansteen
Mon Mar 30, 2015 2:03 am
Forum: Projects
Topic: Reflow Oven - Tune
Replies: 4
Views: 601

Re: Reflow Oven - Tune

Good checks. So the paste did melt and the paste should be OK. With the stencil, did the solder still flow outside the pads? Was the connectivity OK? The mat colouring could be due to the flux residues. It is a no-clean flux. Maybe it needs more heat to really disappear? What happens if you heat it ...
by marcovansteen
Wed Mar 25, 2015 2:22 am
Forum: Projects
Topic: Reflow Oven - Tune
Replies: 4
Views: 601

Re: Reflow Oven - Tune

Hey, nice project. I'm about to try something similar soon. The profile looks OK to me. The measured curve shows no overshoot or instability, so the PID_K* values should be usable. The cool down rate is a bit slow. As soon as the solder is solid, you can open the oven's door, to cool down a faster. ...
by marcovansteen
Wed Aug 13, 2014 7:41 am
Forum: Projects
Topic: 3D Laser Scanner
Replies: 2
Views: 655

Re: 3D Laser Scanner

Fun! Very nice. The next steps depend on what you want to actually do with the data. duh ;) For the hardware: I like the bike-chain a lot but why not move the beam with mirrors on two servos? For software: I'ld say: connect the dots, organize it into planes, and turn the data into some useful inform...
by marcovansteen
Wed Jul 09, 2014 3:38 am
Forum: Projects
Topic: Sensitive microphone
Replies: 5
Views: 1601

Re: Sensitive microphone

An oscilloscope can point you where the problem is: in the amp or in the ADC. The arduino adc is 10 bits IIRC, and probably a bit noisy as well. You could try to find a higher resolution/low noise ADC (>= 16 bit/40kHz or so) Alternately you could try to build a linear-> logarithmic converter. Then y...
by marcovansteen
Thu Jun 12, 2014 5:14 am
Forum: Wireless/RF
Topic: Bluetooth and Nordic on same PCB, anything to watch out for?
Replies: 2
Views: 574

Re: Bluetooth and Nordic on same PCB, anything to watch out

Since WIFI and Bluetooth go together in each smartphone these days, and WIFI power is much stronger than Nordic, I'ld guess that there should be no big problems. The two 2.4G receivers may suffer a bit of 'blind time' when a transmission from one of them saturates the other's preamp. This will cause...
by marcovansteen
Wed May 28, 2014 7:35 am
Forum: Wireless/RF
Topic: nRF24l01+ Need feedback and suggestions
Replies: 3
Views: 574

Re: nRF24l01+ Need feedback and suggestions

Google is your friend: http://hallard.me/nrf24l01-real-life-range-test/ and I've seen also tests here on sparkfun. If the system is really critical for your project, and the projects involves customers, money and the like, I think there is no real alternative to thoroughly understanding the Nordic d...
by marcovansteen
Tue Nov 26, 2013 5:56 am
Forum: Projects
Topic: cmos image sensor with direct output.
Replies: 9
Views: 1391

Re: cmos image sensor with direct output.

Sorry, I forgot one buy-out. Now On-Semi took over the former Cypress image sensors who took over former Fillfactory. Anyway that's not much help since they do not offer Fuga1000 anymore: http://www.onsemi.com/PowerSolutions/parametrics.do?id=101682 . If you really need to stick with pixel-by-pixel ...
by marcovansteen
Tue Nov 26, 2013 4:41 am
Forum: Projects
Topic: cmos image sensor with direct output.
Replies: 9
Views: 1391

Re: cmos image sensor with direct output.

Yes a pixel can stay connected. Think about the nonlinear response, and what that means for your calculations. Note also the time constant (datasheet 5.1), which may severely limit the acquisition speed. You may have no more than 100 pixel readings per second or so. But apparently, you can reach hig...
by marcovansteen
Thu Mar 14, 2013 2:42 pm
Forum: SparkFun Product Questions
Topic: weatherproofing an ultrasonic sensor
Replies: 5
Views: 1835

Re: weatherproofing an ultrasonic sensor

If a smaller range is no issue, you could try to replace the maxbotix piezotransducer with one from a cheap set of car parking sensors.
if you're lucky, their resonance frequency is the same as maxbotix... (if not, you could build the set in your car ;)
by marcovansteen
Fri Jan 04, 2013 8:08 am
Forum: MSP Microcontrollers
Topic: MSP430 RFM12
Replies: 20
Views: 11047

Re: MSP430 RFM12

i notice this is an old thread, but still: @stevech: can't this be improved with lowleakage x5r cap across the battery?
Fast turnon/turnoff is essential to get into the 98% ballpark... NRF24L01 is much faster: 1.5ms startup time vs 5ms.
by marcovansteen
Tue Mar 06, 2012 5:14 am
Forum: SparkFun Product Questions
Topic: El Escudo triac death (and poor documentation)
Replies: 3
Views: 490

Re: El Escudo triac death (and poor documentation)

:-) at times reading datasheets is very difficult! The VTmax that you read is the guaranteed maximum voltage drop across the T1 and T2 terminals at 1.4A current @ 25°C. In general, "breaking down" of any device is specified in the "Absolute maximum" rating section. In this case you read there that a...