Search found 1685 matches

by Valen
Tue Mar 27, 2018 2:07 pm
Forum: SparkFun Product Questions
Topic: Slip Ring USB Camera Problems
Replies: 7
Views: 888

Re: Slip Ring USB Camera Problems

What voltages do you measure on D+ and D- and Vcc (5 volt from USB) against GND with connected slip ring. And a second time with webcam plugged in? [EDIT: You do also 'slip through' the 5 volt and GND wires right? Not just D+ and D-. Those always need GND for sure. [EDIT 2: what current is drawn by ...
by Valen
Sat Mar 24, 2018 11:38 am
Forum: Arduino
Topic: Connect Arduino to Wifi router?
Replies: 2
Views: 104

Re: Connect Arduino to Wifi router?

For a wifi-router connected Arduino solution the ESP8266 (Sparkfun's Thing or various other modules) would be the best solution. It can be programmed in Arduino and has Wifi built in. But programming network code yourself is not suited for a beginner. http://arduino-esp8266.readthedocs.io/en/latest/...
by Valen
Sat Mar 24, 2018 11:26 am
Forum: SparkFun Product Questions
Topic: Slip Ring USB Camera Problems
Replies: 7
Views: 888

Re: Slip Ring USB Camera Problems

Have you measured the resistance of the contacts? And voltages of D+ and D-. There might be some voltage drop. D+ and D- need to be at certain levels to tell the host what kind of USB speed device is attached.

Consult 'USB in a nutshell': http://www.beyondlogic.org/usbnutshell/ ... Electrical
by Valen
Sat Mar 24, 2018 11:13 am
Forum: SparkFun Product Questions
Topic: Interfacing Thing Dev with another device using I2C and Arduino
Replies: 9
Views: 185

Re: Interfacing Thing Dev with another device using I2C and Arduino

What color leds did you try? The 3.3 volt supply of the Thing is not sufficiently high to make blue or white leds light up. Better use red, green or yellow leds. Don't forget that LEDs have a polarity. If it doesn't light up, rotate the led. You might have connected it in reverse the first time.
by Valen
Sat Mar 24, 2018 10:59 am
Forum: SparkFun Product Questions
Topic: Interfacing Thing Dev with another device using I2C and Arduino
Replies: 9
Views: 185

Re: Interfacing Thing Dev with another device using I2C and Arduino

I don't have the ESP8266 Thing dev board either. By the looks of the schematic pin GPIO14 does not have a pull up resistor. But on the PWM driver there is, 10k Ohm. So that is good. How long are the wires between the Thing board and the PWM driver?
by Valen
Fri Mar 23, 2018 8:49 am
Forum: SparkFun Product Questions
Topic: Interfacing Thing Dev with another device using I2C and Arduino
Replies: 9
Views: 185

Re: Interfacing Thing Dev with another device using I2C and Arduino

Have you tried with just a single led (with current limiting resistor) on the PWM output to test if there is a changing voltage at all? Try to reduce complexity by testing if indivudual parts work as they should. So first without mosfet and ledstring.
by Valen
Fri Mar 23, 2018 7:04 am
Forum: Wireless/RF
Topic: xbee with e-paper
Replies: 1
Views: 98

Re: xbee with e-paper

Seems like digi.com is the place with the most reliable answer. That datasheet says it is "based on" the em357 chip. Maybe they use a customized reduced ram version.
by Valen
Fri Mar 23, 2018 6:56 am
Forum: SparkFun Product Questions
Topic: Interfacing Thing Dev with another device using I2C and Arduino
Replies: 9
Views: 185

Re: Interfacing Thing Dev with another device using I2C and Arduino

Even the simplest code can contain mistakes. Show it (entirely).
by Valen
Wed Mar 21, 2018 9:19 am
Forum: Arduino
Topic: Fio V3 - USB to Serial on the micro USB connector?
Replies: 3
Views: 126

Re: Fio V3 - USB to Serial on the micro USB connector?

There are some USB-host shields around on the market. But those are mostly for the Arduino Uno form-factor. You might be able to hack some kind of interface together though.
by Valen
Tue Mar 20, 2018 8:20 am
Forum: Projects
Topic: Using and external push button switch with Arduino?
Replies: 4
Views: 149

Re: Using and external push button switch with Arduino?

Sorry, I'm willing to help find fault conditions and errors in programming once you've integrated the basic elements. But I'm not going to spoon feed a program.
by Valen
Tue Mar 20, 2018 8:14 am
Forum: SparkFun Product Questions
Topic: XBee Discovery in XCTU
Replies: 13
Views: 335

Re: XBee Discovery in XCTU

Excellent! What was the solution?
by Valen
Mon Mar 19, 2018 4:23 pm
Forum: Arduino
Topic: Fio V3 - USB to Serial on the micro USB connector?
Replies: 3
Views: 126

Re: Fio V3 - USB to Serial on the micro USB connector?

The USB connector on the FIO needs to be connected to a USB host, like a computer. The FIO is a USB-slave and cannot act as a USB host. (Well, maybe with a serious rewrite of the firmware. But I haven't heard of any) You'd have to implement a second software serial port on different digital pins to ...
by Valen
Mon Mar 19, 2018 4:16 pm
Forum: Projects
Topic: Using and external push button switch with Arduino?
Replies: 4
Views: 149

Re: Using and external push button switch with Arduino?

Start with learning the basics of Arduino programming first. Plenty of examples for that. Don't worry about your project immediately. Learn how to detect switch states. Turn on leds before using high power relays and motors. Learn how to loop and use conditional code first. For the timing you would ...
by Valen
Fri Mar 16, 2018 8:44 am
Forum: Projects
Topic: DIP-8 Digital Potentiometer that does not require microcontroller
Replies: 3
Views: 109

Re: DIP-8 Digital Potentiometer that does not require microcontroller

Those digital pots can be used 'manually'. All it takes is a few switches (with proper switch-debounce filtering and pull up resistors). There is no limit on how long you can hold the pulses. Only the pulse edges need to be of a certain steepness. But it will take quite a bunch of keypresses to scan...