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Re: Can this be used as I2C Master?

 by jacquelbot ¦  Tue Nov 06, 2018 10:47 am ¦  Forum: Forum ¦  Topic: Can this be used as I2C Master? ¦  Replies: 5 ¦  Views: 1787

How about this Sparkfun board: https://www.sparkfun.com/products/13990
Processor + bluetooth (+WiFi & NFC if that's of interest to you) and it's got two I2C ports to talk to your sensor AND it's cheaper than the bluetooth module you linked above.

Re: From prototype to production?

 by jacquelbot ¦  Thu Oct 11, 2018 1:38 pm ¦  Forum: Forum ¦  Topic: From prototype to production? ¦  Replies: 7 ¦  Views: 2248

With practice (and the right tip), tiny parts certainly can be hand soldered. For prototypes with SMT parts, a step between solderless breadboard and custom PCB can be using adapter boards. Check out all the different ones available on Digikey https://www.digikey.com/products/en/prototyping-fabricat...

Re: Alternating 3 LED project

 by jacquelbot ¦  Thu Oct 11, 2018 9:39 am ¦  Forum: Projects ¦  Topic: Alternating 3 LED project ¦  Replies: 3 ¦  Views: 293

I think this would be simplest with an Arduino. There's a sample program called "Blink," it's one of the simplest possible programs, that could be modified a little to do what you want. I'm imagining you using 3 LEDs of each color so that you can diffuse the light and have a reasonably large circle ...

Re: Arduino Programming for Salami Production

 by jacquelbot ¦  Tue Oct 09, 2018 1:21 pm ¦  Forum: Projects ¦  Topic: Arduino Programming for Salami Production ¦  Replies: 3 ¦  Views: 742

That sounds like a really fun, kinda big project! This https://www.sparkfun.com/products/14236 will let you turn on and off your cooler/light/humidifier/fan from the Arduino. (I think this is what you meant by "switch board"?) Unfortunately, I think you'll need a separate one for each appliance sinc...

Re: Getting started using Flexinol wire.

 by jacquelbot ¦  Tue Apr 12, 2016 6:34 am ¦  Forum: SparkFun Product Questions ¦  Topic: Getting started using Flexinol wire. ¦  Replies: 1 ¦  Views: 224

Have you tried it with a real power supply? A regular 9V battery is not going to give you enough current (or at least not for very long!). From the Dynalloy site, the Flexinol wire with a pull force of 2.83 lbs requires about 1.5 amps for a second to cause that kind of contraction.

Re: Questions about FLiR Lepton

 by jacquelbot ¦  Tue Feb 09, 2016 8:14 am ¦  Forum: SparkFun Product Questions ¦  Topic: Questions about FLiR Lepton ¦  Replies: 1 ¦  Views: 182

On page 42 of the FLIR Lepton's datasheet, it has a specification that the maximum range of temperatures that can be distinguished inside a scene is 0 - 400 degrees Kelvin. So looking at a 110 degC object in a roughly room temperature (23degC-ish?) place would only give you a swing of 87 degC (or de...

Re: Sunny Buddy fault light

 by jacquelbot ¦  Tue Feb 09, 2016 7:59 am ¦  Forum: SparkFun Product Questions ¦  Topic: Sunny Buddy fault light ¦  Replies: 6 ¦  Views: 512

The datasheet of the LT3652 chip explains what it means. Basically if a fault occurs during battery charging, like overheating (NTC resistor) or charging takes too long, that pin goes high . But it is to be read in combination with the notCHRG pin. Why don't you connect leds to it? Better to be sur...

Re: Sunny Buddy fault light

 by jacquelbot ¦  Mon Feb 08, 2016 12:21 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Sunny Buddy fault light ¦  Replies: 6 ¦  Views: 512

If the charging chip is seeing a problem, it'll pull the fault line LOW. If you're seeing a positive voltage on that pad, the LT3652 (U1) thinks everything is a-ok. Here's the relevant snippet from the datasheet: "FAULT (Pin 5): Open-Collector Charger Status Output; typically pulled up through a res...