Search found 2149 matches

by jremington
Fri May 25, 2018 8:34 am
Forum: Arduino
Topic: Newbie here and proposed project.
Replies: 4
Views: 37

Re: Newbie here and proposed project.

It is not as much fun as your idea, but the vineyards in my area use propane cannons fired at random intervals to frighten off birds.
Works very well.

DIY carbide cannon here: https://www.youtube.com/watch?v=5MP2DmkcPk0
by jremington
Thu May 17, 2018 7:54 am
Forum: General Chit Chat
Topic: BGA Rework!!!
Replies: 3
Views: 106

Re: BGA Rework!!!

Which BGA Rework services in Illinois have you already contacted?

What are their prices?

What do you consider to be "reasonable"?
by jremington
Wed May 09, 2018 7:20 pm
Forum: Arduino
Topic: Reading from Atlas Scientific Dissolved Oxygen sensor
Replies: 1
Views: 66

Re: Reading from Atlas Scientific Dissolved Oxygen sensor

It looks like you got partway through modifying code for a ping sensor, but didn't finish. Among other possible errors, what is a dissolved oxygen sensor supposed to do with a command that tells it to measure in "inches"? (Hint: that command does something else entirely). Wire.write(byte(0x50)); // ...
by jremington
Mon May 07, 2018 9:25 am
Forum: Arduino
Topic: Arduino Coding for RTCds3231
Replies: 1
Views: 57

Re: Arduino Coding for RTCds3231

Google "arduino ds3231 alarm"
by jremington
Sat May 05, 2018 7:29 am
Forum: Arduino
Topic: How to address more than two accelerometers?
Replies: 1
Views: 86

Re: How to address more than two accelerometers?

only seem to be able to set the LSB either high or low That is all you need. Address all the sensors with the same address, but connect different port pins to each sensor's AD0 line to control high/low. Make sure that only one of the sensors has the proper address at any one time, and only that one...
by jremington
Tue May 01, 2018 3:42 pm
Forum: Projects
Topic: Where Can I Buy a Mouse Sensor?
Replies: 1
Views: 80

Re: Where Can I Buy a Mouse Sensor?

Surely you can scavenge one out of a used mouse. The computer recycling center in my town has boxes of them, cost less than a cup of coffee.
by jremington
Mon Apr 30, 2018 1:07 pm
Forum: Wireless/RF
Topic: Simple / cheap acoustic modem
Replies: 3
Views: 181

Re: Simple / cheap acoustic modem

Sadly, underwater transducers are expensive and for 300 meters range, generally require high voltage electronics for the transmitter.

You could experiment with a simple piezo disk as a transducer, but they are not efficient at transmitting sound energy into water.
by jremington
Mon Apr 30, 2018 10:47 am
Forum: Wireless/RF
Topic: Simple / cheap acoustic modem
Replies: 3
Views: 181

Re: Simple / cheap acoustic modem

Please add details describing the acoustic modem, and what you want it to do.
by jremington
Thu Apr 26, 2018 7:12 am
Forum: SparkFun Product Questions
Topic: crypto hardware
Replies: 2
Views: 128

Re: crypto hardware

You forgot to tell us what you want to do.
by jremington
Mon Apr 23, 2018 3:10 pm
Forum: Arduino
Topic: Splitting Strings - arduino
Replies: 2
Views: 89

Re: Splitting Strings - arduino

It is best to avoid Strings on Arduino, because they cause memory problems and eventual program crashes. Instead, use character arrays (C-strings) and the reliable functions that go with them. For example: char NumX[] = "00123,456,789,1011,1213,,14,15,1617"; The function strtok() can be used to sear...
by jremington
Mon Apr 23, 2018 8:31 am
Forum: PCB Design Questions
Topic: Running contrary to the advertised feature that "Reverse leakage current less than 10uA"??
Replies: 3
Views: 124

Re: Running contrary to the advertised feature that "Reverse leakage current less than 10uA"??

If the device is to be used with a solar panel, then a series diode already has to be in place. Problem solved.

Agreed, the data sheet should specify that the device will be destroyed in the absence of such series protection.
by jremington
Sun Apr 22, 2018 7:23 am
Forum: General Chit Chat
Topic: Measure Angle of Object
Replies: 3
Views: 381

Re: Measure Angle of Object

Assuming that the palm is held flat, two or more distance measurements and some geometry can be used to determine the angles involved.

Non-scanning distance sensors return only one measurement at a time, so you would have to use several pointing in different directions, or figure out how to aim one.
by jremington
Sat Apr 21, 2018 7:51 am
Forum: General Chit Chat
Topic: Measure Angle of Object
Replies: 3
Views: 381

Re: Measure Angle of Object

Describe object.

For an arbitrary object, how do you define "parallel to face of camera sensor"?
by jremington
Fri Apr 20, 2018 8:15 am
Forum: Projects
Topic: Knowing where a robot is looking
Replies: 3
Views: 118

Re: Knowing where a robot is looking

It looks like the encoder PCB is held on to the motor by the solder connections to the motor terminals, see arrows on attached photo. You will have to unsolder those cleanly in order to safely remove the PCB, after pulling off the magnet (best to use a micro-sized gear puller). Otherwise you will pr...