Search found 333 matches

by DanV
Mon Apr 30, 2018 12:48 pm
Forum: Arduino
Topic: Line following robot help
Replies: 1
Views: 91

Re: Line following robot help

Please enlighten us as to what it doesn't do correctly! So, did you learn to program and dream that code up yourselves (you say that's what you've come up with so far). You should check this section of code: sensorValue = analogRead(sensorPin); Serial.println(sensorValue); sensorValue = analogRead(s...
by DanV
Wed Apr 25, 2018 8:13 am
Forum: Projects
Topic: Motorizing a height adjustable desk
Replies: 1
Views: 61

Re: Motorizing a height adjustable desk

What servo are you talking about?
Certainly a hobby (or RC style) servo will not be strong enough.

How much effort does it require on the hand crank and what is its length.
You can figure out the torque requirements from there.
by DanV
Thu Apr 19, 2018 6:54 am
Forum: Arduino
Topic: Triggering 8 Disposable Cameras with Solenoids
Replies: 1
Views: 65

Re: Triggering 8 Disposable Cameras with Solenoids

You will experience a delay while the relays actuate. Typical pull-in times for mechanical relays are 8 - 15 milliseconds. Then you will experience a similar delay with the solenoids. If that doesn't affect you, the solenoid inrush current will - it can easily be 10 times the holding current. Why no...
by DanV
Wed Apr 18, 2018 8:29 am
Forum: Projects
Topic: Waste Tank Discharge Project
Replies: 11
Views: 219

Re: Waste Tank Discharge Project

BTW, what pump motor are you expecting to be using?
AC, DC, what kind of power does it draw?
by DanV
Wed Apr 18, 2018 7:26 am
Forum: SparkFun Product Questions
Topic: Best Relay for 1/2 HP 120v AC Motor (DIN rail maybe?)
Replies: 7
Views: 211

Re: Best Relay for 1/2 HP 120v AC Motor (DIN rail maybe?)

There's cause for some concern about when that relay fails it would fail in the ON state but that's likely true of a mechanical relay as well. A 40 Amp relay has plenty of capacity to have a huge long life in this sort of application. Crydom says you should run their SS relays at no more than 75% of...
by DanV
Wed Apr 18, 2018 7:21 am
Forum: Projects
Topic: Waste Tank Discharge Project
Replies: 11
Views: 219

Re: Waste Tank Discharge Project

SparkFun has a 40 amp solid state SPST relay that would likely do your job nicely. https://www.sparkfun.com/products/13815 The only change to the diagram #4 is that your motor would be wired in parallel with the relay coil because there's only have one contact on that SS relay. Have a look at this t...
by DanV
Tue Apr 17, 2018 9:32 am
Forum: SparkFun Product Questions
Topic: OpenLog ftdi connection
Replies: 11
Views: 324

Re: OpenLog ftdi connection

The hookup Guide clearly states the power ratings:
  • VCC Input 3.3V-12V (Recommended 3.3V-5V)
    RXI Input 2.0V-3.8V
    TXO Output 3.3V
by DanV
Mon Apr 16, 2018 7:16 am
Forum: SparkFun Product Questions
Topic: Best Relay for 1/2 HP 120v AC Motor (DIN rail maybe?)
Replies: 7
Views: 211

Re: Best Relay for 1/2 HP 120v AC Motor (DIN rail maybe?)

The solid state relay will far outlast the electromechanical relay. The zero crossing nature os the solid state means it will switch the load on/off when the AC waveform is at zero volts. the EM relay will not have this - opening the relay contacts will cause arcing and wear on the contacts. You wil...
by DanV
Fri Apr 13, 2018 11:58 am
Forum: Projects
Topic: Waste Tank Discharge Project
Replies: 11
Views: 219

Re: Waste Tank Discharge Project

Well, I certainly don't know what I was thinking when I said bottom switch normally closed. Of course it's normally open. With high water level, both switches are closed, starts the sequence which runs until the bottom switch goes from held closed by the float to open which opens the latch circuit. ...
by DanV
Thu Apr 12, 2018 7:18 am
Forum: Projects
Topic: capacitor value
Replies: 1
Views: 91

Re: capacitor value

I'm sorry, but it isn't clear what you want. Capacitors in AC or DC circuits? or both? What are you wanting to use it for? And you really have not searched the internet very well since there are Millions of resources out there: https://www.allaboutcircuits.com/textbook/direct-current/chpt-13/electri...
by DanV
Tue Apr 10, 2018 12:10 pm
Forum: Projects
Topic: Distance measurement project
Replies: 2
Views: 96

Re: Distance measurement project

If you were to use Google to search for "Merging arduino code", you would find many articles on the subject: http://www.thebox.myzen.co.uk/Tutorial/Merging_Code.html https://en.wikiversity.org/wiki/Arduino_Sketch_Merge https://arduino-info.wikispaces.com/CombiningArduinoSketches and on and on. Try i...
by DanV
Tue Apr 10, 2018 6:21 am
Forum: SparkFun Product Questions
Topic: Float Switches and Pump Logic
Replies: 3
Views: 134

Re: Float Switches and Pump Logic

You posted in the projects forum - you don't need to post in multiple forums.
by DanV
Tue Apr 10, 2018 6:15 am
Forum: Projects
Topic: Waste Tank Discharge Project
Replies: 11
Views: 219

Re: Waste Tank Discharge Project

First question - Don't your float switches each have 2 contacts? 1 Normally open and 1 normally closed? If yes, then it's relatively simple to set up a circuit using a relay to latch the top switch normally open contact (and start the pump) along with the bottom switch normally closed contact used t...
by DanV
Thu Apr 05, 2018 1:29 pm
Forum: Projects
Topic: MP3 Trigger Volume and File Type?
Replies: 11
Views: 296

Re: MP3 Trigger Volume and File Type?

If you drive a 0.5 watt speaker with 30 watts, it will damage the speaker in one or more ways. We're only talking 1.4 watts but it is still over powering the speaker. Any box you can put the speaker in will greatly improve the sound - even if you affix it to a deodorant can lid. If you allow the sou...
by DanV
Thu Apr 05, 2018 9:29 am
Forum: Arduino
Topic: A Library Question
Replies: 17
Views: 301

Re: A Library Question

... using the reliable, well written and well documented functions provided by the SD library.
Agreed!

But, if it works for you, then all is good.
It's not the first time I've seen this sort of thing and I'm sure it won't be the last.