Search found 990 matches

by n1ist
Thu Feb 22, 2018 9:52 am
Forum: Arduino
Topic: Wiring many ir phototransistors to arduino
Replies: 14
Views: 152

Re: Wiring many ir phototransistors to arduino

What is the part number for the "phototransistor"? From the diagram, it looks like you have a photointerruptor (phototransistor and LED in one package). If that's the case, it looks like you have the resistors swapped.
/mike
by n1ist
Thu Feb 22, 2018 9:50 am
Forum: Arduino
Topic: Micro OLED Breakout & Micro SD on UNO - HOW?
Replies: 3
Views: 48

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

Make sure the voltage levels are compatible between the SD shield, OLED, and the UNO itself...
by n1ist
Tue Feb 20, 2018 7:17 pm
Forum: SparkFun Product Questions
Topic: Difficulties using a Skittles sorter
Replies: 5
Views: 140

Re: Difficulties using a Skittles sorter

Post using code tags [ code ] and [ /code ] (without spaces...) That will preserve formatting and make it easier to read the code.
/mike
by n1ist
Mon Feb 19, 2018 1:43 pm
Forum: Projects
Topic: Connecting El wire, El sequencer, XBEE in a suit
Replies: 1
Views: 46

Re: Connecting El wire, El sequencer, XBEE in a suit

Vixen can do this with the serial plugin. Hop on over to doityourselfchristmas.com or www.diychristmas.org - this has been done over there. I wouldn't bother with DMX for this (the XBEE can only handle a small number of channels of DMX due to the data rate unless you are doing raw 802.15.4) Recently...
by n1ist
Sun Feb 18, 2018 7:05 pm
Forum: SparkFun Site Questions/Comments
Topic: Sparkfun logo in upper left not going to SF homepage
Replies: 1
Views: 41

Sparkfun logo in upper left not going to SF homepage

The Sparkfun Electronics logo in the upper left used to link to the main Sparkfun page; now it links to the forum home. It's good to have a link back to the main site so it's easy to get there when looking up answers to peoples' questions. Thanks.
/mike
by n1ist
Sat Feb 17, 2018 4:46 pm
Forum: Projects
Topic: two adruino pro trinkets on single master power switch
Replies: 7
Views: 114

Re: two adruino pro trinkets on single master power switch

That picture was how to do it with an SPDT switch instead, just for some more information. Your drawing is correct for the switch you have.
/mike
by n1ist
Fri Feb 16, 2018 5:47 am
Forum: Projects
Topic: two adruino pro trinkets on single master power switch
Replies: 7
Views: 114

Re: two adruino pro trinkets on single master power switch

Yes, that would work. The top row of pins are not connected to the bottom row so they can be used to control two independent circuits. Because of this, we don't need to add any diodes to the circuit. The switch is not polarized; for this use, it doesn't matter which gets the red wire and which the b...
by n1ist
Thu Feb 15, 2018 7:37 pm
Forum: Projects
Topic: two adruino pro trinkets on single master power switch
Replies: 7
Views: 114

Re: two adruino pro trinkets on single master power switch

If your switch is like most of the 4-pin 3 position slide switches, it works like this: (check with an ohmmeter to be sure) Left o-o o o o-o o o Center o o-o o o o-o o Right o o o-o o o o-o So connect it like this + + B o o o o o o o o R + + R where B is the power going to the blade trinket, R is th...
by n1ist
Wed Feb 14, 2018 6:28 am
Forum: Projects
Topic: Multi-zone 12-Volt Lighting Control Questions
Replies: 3
Views: 74

Re: Multi-zone 12-Volt Lighting Control Questions

Certainly doable. I would not bother with digital pots in this application; I would simply PWM the LEDs. Probably the easiest would be to use would be the https://www.sparkfun.com/products/10616 TLC5490 board (or https://www.sparkfun.com/products/10615 shield). On either board, you will need to remo...
by n1ist
Tue Feb 13, 2018 9:35 am
Forum: Projects
Topic: Multi-zone 12-Volt Lighting Control Questions
Replies: 3
Views: 74

Re: Multi-zone 12-Volt Lighting Control Questions

What are the "lighting zones" and how are they controlled? Most digital pots have limited voltage ranges and are not isolated from ground. You need to start by figuring out the voltages, currents, signal types and format, distance, and isolation needs before going further. Also, how do you want to c...
by n1ist
Thu Feb 08, 2018 1:35 pm
Forum: SparkFun Product Questions
Topic: 5-way Tactile Switch to Raspberry Pi
Replies: 2
Views: 69

Re: 5-way Tactile Switch to Raspberry Pi

That has 5 switches in one package; it doesn't draw any power. Wiring it as you describe should work; you can either use the on-chip pullups on the Pi or add your own; To make things simple, I'd go with the on-chip ones.
by n1ist
Wed Feb 07, 2018 1:09 pm
Forum: PCB Design Questions
Topic: Sparkfun EAGLE LED library problem
Replies: 1
Views: 58

Re: Sparkfun EAGLE LED library problem

Looks like something a patch or diff tool has left in the file...
by n1ist
Mon Feb 05, 2018 8:50 am
Forum: SparkFun Product Questions
Topic: How to power the Sparkfun CAN bus shield through the OBD pin?
Replies: 2
Views: 82

Re: How to power the Sparkfun CAN bus shield through the OBD pin?

Look at the schematic for the CAN shield https://cdn.sparkfun.com/datasheets/Dev/Arduino/Shields/SparkFun_CAN-Bus_Shield_v13a.pdf Pin 9 of the DE9 would connect to 12V in the car. Pin 2 (unless you played with the solder jumpers) is ground. Pin 9 connects to the Vin pin on the Arduino through a fuse...
by n1ist
Fri Jan 26, 2018 5:27 am
Forum: Projects
Topic: Dual output AC/DC power supply
Replies: 3
Views: 127

Re: Dual output AC/DC power supply

Two other ideas come to mind: - Use two power supplies - one for 5V and one for 12V. Tie their negative outputs together to the circuit ground, or keep them separate and use the 12v one only for the loads - Use one larger 12V supply and add a switching buck regulator to drop the 12v down to 5V. I wo...