Search found 2324 matches

by jremington
Sat Jan 19, 2019 10:45 pm
Forum: SparkFun Product Questions
Topic: LIS331 DL Accelerometer
Replies: 1
Views: 29

Re: LIS331 DL Accelerometer

All magnetometers need to be calibrated to be useful. Yours has a rather severe Z offset, but that is not uncommon. At the minimum you need to estimate offsets and scale factors for each axis. Simple procedure to calibrate a related magnetometer: https://appelsiini.net/2018/calibrate-magnetometer/ M...
by jremington
Fri Jan 18, 2019 8:33 pm
Forum: SparkFun Product Questions
Topic: How to "calibrate" a micro:bot?
Replies: 2
Views: 37

Re: How to "calibrate" a micro:bot?

Note: any magnetic or iron containing materials, as well as current carrying wires near the compass will distort the Earth's magnetic field, and so calibration must be performed in place. In some cases, calibration may not even be possible due to such environmental interference. See https://support....
by jremington
Fri Jan 18, 2019 7:57 pm
Forum: SparkFun Product Questions
Topic: How to "calibrate" a micro:bot?
Replies: 2
Views: 37

Re: How to "calibrate" a micro:bot?

In principle, you could use the compass on the micro:bit to determine the heading relative to magnetic North. IF (big if) the compass is properly calibrated, reasonably accurate turns can be judged from the change in heading. I know nothing about using the micro:bit but perhaps there is a forum or w...
by jremington
Tue Jan 15, 2019 8:12 pm
Forum: Wireless/RF
Topic: Arduino APRS Transmitter
Replies: 1
Views: 39

Re: Arduino APRS Transmitter

Mine sounds more like a brief beep lasting about a second. The transmitter is not working correctly. Are you familiar with this Arduino APRS modem page? https://unsigned.io/projects/microaprs/ Works well for me using standard radios. You might ask the author about interfacing it with the HX1. Many ...
by jremington
Sun Jan 13, 2019 10:15 am
Forum: Arduino
Topic: distance measuring sensor
Replies: 1
Views: 27

Re: distance measuring sensor

What is a running rope?
by jremington
Mon Jan 07, 2019 9:41 pm
Forum: SparkFun Product Questions
Topic: Sunny Buddy Solar charger voltage output
Replies: 1
Views: 33

Re: Sunny Buddy Solar charger voltage output

As a brief glance at the Sunny Buddy product page will show, it is intended for solar panels with output voltage between 6 and 20V, and is for charging single cell LiPo batteries. The output voltage should never exceed 4.2V. If you want a 12V system, lead acid batteries are preferred as they are che...
by jremington
Sun Jan 06, 2019 6:24 pm
Forum: Projects
Topic: Electronic number Lock
Replies: 2
Views: 48

Re: Electronic number Lock

Many, many people have used Arduino to send SMS messages and have posted tutorials or project descriptions on line. Others have made keypad/door locks and posted those projects too.

Google will be happy to show them to you.
by jremington
Sat Jan 05, 2019 9:49 am
Forum: General Chit Chat
Topic: Newbee wanting to build arduino "smartwatch"
Replies: 2
Views: 171

Re: Newbee wanting to build arduino "smartwatch"

Lots of people have done that. Google "arduino wristwatch" or similar for many examples.
by jremington
Wed Jan 02, 2019 10:24 am
Forum: New Product Ideas
Topic: Would like to see an inclinometer breakout board
Replies: 1
Views: 87

Re: Would like to see an inclinometer breakout board

Any ordinary accelerometer makes a fine inclinometer. For best accuracy you need to calibrate it, by following this tutorial: https://thecavepearlproject.org/2015/05 ... r-arduino/

Google "accelerometer tilt measurements" for the basic theory and simple code.
by jremington
Mon Dec 31, 2018 8:36 pm
Forum: Projects
Topic: Solar charger for NIMH batteries.
Replies: 5
Views: 112

Re: Solar charger for NIMH batteries.

Of course you can, but that requires circuitry to know when the batteries are fully charged. Look around for some other charger designs. 30 seconds of googling turned up this 5V USB charger, which might work with your panel: http://www.stefanv.com/electronics/usb_charger.html Or, buy a cheap USB AA ...
by jremington
Mon Dec 31, 2018 5:57 pm
Forum: Projects
Topic: Solar charger for NIMH batteries.
Replies: 5
Views: 112

Re: Solar charger for NIMH batteries.

The design you linked is for a 22 V solar panel and is way overkill for a single AA battery. It won't work at all with a 5V panel. In full sun, your 5V, 500 mA panel will charge 2 AA NiMH (2200 mAh) series connected batteries in about five hours. All you need is a diode to prevent the panel from dis...
by jremington
Mon Dec 31, 2018 12:34 pm
Forum: SparkFun Product Questions
Topic: Does the 7 Segment Serial Display Require Arduino?
Replies: 7
Views: 96

Re: Does the 7 Segment Serial Display Require Arduino?

The "firmware" is written in C/C++, as is standard for Arduino, and is quite complicated. If you have little or no experience with C/C++ or with Arduino, it would be an enormous challenge to rewrite it. A standard Arduino can use that display, and it would be rather simple to write a program to coun...
by jremington
Mon Dec 31, 2018 9:19 am
Forum: SparkFun Product Questions
Topic: Does the 7 Segment Serial Display Require Arduino?
Replies: 7
Views: 96

Re: Does the 7 Segment Serial Display Require Arduino?

Yes, there are enough I/O pins on the display to do that. You will have to remove/rewrite most of the firmware in one of the displays, in order to make it capable of handling the buttons, the FSR and send info to another display. There is really no need for two displays, though. With the indicators,...
by jremington
Sun Dec 30, 2018 6:40 pm
Forum: SparkFun Product Questions
Topic: Does the 7 Segment Serial Display Require Arduino?
Replies: 7
Views: 96

Re: Does the 7 Segment Serial Display Require Arduino?

Possibly, but if you will take a few moments to describe your entire project, someone might be able to supply an informed answer.