Search found 1641 matches

by Valen
Fri Feb 23, 2018 9:06 am
Forum: Arduino
Topic: Wiring many ir phototransistors to arduino
Replies: 14
Views: 157

Re: Wiring many ir phototransistors to arduino

correction: "instantaneous" must be "average".
by Valen
Fri Feb 23, 2018 8:33 am
Forum: Arduino
Topic: Wiring many ir phototransistors to arduino
Replies: 14
Views: 157

Re: Wiring many ir phototransistors to arduino

Ok, now we know what IR photoreflector sensor you are talking about, how do they need to be activated? Powering, or rather pulling up, 50 phototransistors is not a very high power drain. Making each of those leds emit is however. If each is required to be fed with 20 mA then you'll need to supply th...
by Valen
Thu Feb 22, 2018 2:08 pm
Forum: General Chit Chat
Topic: bad led is blinking
Replies: 3
Views: 216

Re: bad led is blinking

That's why I said usually!
by Valen
Thu Feb 22, 2018 10:37 am
Forum: Arduino
Topic: Wiring many ir phototransistors to arduino
Replies: 14
Views: 157

Re: Wiring many ir phototransistors to arduino

Well, if it is indeed a QRD1114 then Sparkfun has a Hookup-guide for it: https://learn.sparkfun.com/tutorials/qrd1114-optical-detector-hookup-guide (and it turns out to be both a led and a phototransistor!) The question now is how in that fritzing diagram are the 4 pins aranged. In order of 1,2,3,4,...
by Valen
Thu Feb 22, 2018 10:27 am
Forum: SparkFun Product Questions
Topic: Digital Potentiometer
Replies: 1
Views: 69

Re: Digital Potentiometer

It should be in the datasheet. There is no rule for manufacturers that it should be operated in a certain way.
by Valen
Thu Feb 22, 2018 9:52 am
Forum: Arduino
Topic: Micro OLED Breakout & Micro SD on UNO - HOW?
Replies: 3
Views: 52

Re: Micro OLED Breakout & Micro SD on UNO - HOW?

Whoops, totally missed that.
by Valen
Wed Feb 21, 2018 3:18 pm
Forum: SparkFun Site Questions/Comments
Topic: Functions code of calcAccel, calcGyro and calcGyro
Replies: 1
Views: 52

Re: Functions code of calcAccel, calcGyro and calcGyro

Quote from the hookup guide: The 9DoF Razor IMU's firmware is available in the product's GitHub repository . To upload the firmware, you'll need the SparkFun SAMD21 board definitions and the SparkFun MPU-9250 DMP Arduino library installed on your machine. Which is exactly what we're going to documen...
by Valen
Wed Feb 21, 2018 3:12 pm
Forum: General Chit Chat
Topic: bad led is blinking
Replies: 3
Views: 216

Re: bad led is blinking

Visual inspection usually does not show how electrons are flowing. 1st rule of troubleshooting electronics is "Measure Voltages". And instead of a video with hidden away wiring please provide a matching schematic and part information of the led modules.
by Valen
Wed Feb 21, 2018 3:04 pm
Forum: SparkFun Site Questions/Comments
Topic: Sparkfun logo in upper left not going to SF homepage
Replies: 1
Views: 42

Re: Sparkfun logo in upper left not going to SF homepage

Agreed, The Forum Home link is already there a few lines or so below.
by Valen
Wed Feb 21, 2018 2:55 pm
Forum: New Product Ideas
Topic: Ultrasonic motors?
Replies: 4
Views: 161

Re: Ultrasonic motors?

lyndon wrote:
Sun Feb 18, 2018 11:42 am
Muscle wires?
https://www.sparkfun.com/products/11900
Since a fair amount of current runs through such a wire, there is still a magnetic field emanating from it. Weak perhaps, but still there. If that is a problem is up for experimentation.
by Valen
Wed Feb 21, 2018 2:49 pm
Forum: Arduino
Topic: Micro OLED Breakout & Micro SD on UNO - HOW?
Replies: 3
Views: 52

Re: Micro OLED Breakout & Micro SD on UNO - HOW?

Each device needs a unique CS pin. It is the chip select pin. The others can be shared.
by Valen
Wed Feb 21, 2018 2:36 pm
Forum: SparkFun Product Questions
Topic: CH340G uart and hid compatable?
Replies: 1
Views: 168

Re: CH340G uart and hid compatable?

It's a USB to serial converter. USB devices connected through a hub are intended to work independant alongside eachother. They should not interfere as USB is a standard that takes care of conflicts. Not sure how you want that CH340G to interact with USB mouse and keyboards though. The RPi Zero is th...
by Valen
Wed Feb 21, 2018 2:15 pm
Forum: Arduino
Topic: Wiring many ir phototransistors to arduino
Replies: 14
Views: 157

Re: Wiring many ir phototransistors to arduino

First, is the problem supplying power to 50 IR LEDs emiting IR light, or 50 infrared receiving phototransistors? Once that is answered and you mean photo transistors receiving light: How do you intend to monitor those 50 different output signals to a device that (in the case of the largest: an Ardui...
by Valen
Fri Feb 09, 2018 11:33 am
Forum: SparkFun Product Questions
Topic: Best Microcontroller at Sparkfun?
Replies: 1
Views: 161

Re: Best Microcontroller at Sparkfun?

Is that important to know?
by Valen
Fri Feb 09, 2018 11:30 am
Forum: SparkFun Product Questions
Topic: SparkFun SEN - 13322 soil moisture sensor specification or data sheet
Replies: 1
Views: 145

Re: SparkFun SEN - 13322 soil moisture sensor specification or data sheet

Whatever current it consumes (depends on the conductance of the soil/whatever sludge solution) it has to go through a 10k resistor. So with a 5 volt supply and atleast that amount of resistance (transistor fully conducting) the current is at most 5/10,000.= 0.5 mA Accuracy or resolution makes no sen...