Search found 43 matches

by free-bee
Sun Apr 29, 2018 8:31 am
Forum: Projects
Topic: External Memory Device for 8-Bit Computer?
Replies: 4
Views: 122

Re: External Memory Device for 8-Bit Computer?

I do not. I don't recall ever hearing of one either. What is it, exactly?
by free-bee
Fri Apr 27, 2018 6:03 pm
Forum: Projects
Topic: External Memory Device for 8-Bit Computer?
Replies: 4
Views: 122

External Memory Device for 8-Bit Computer?

I have found myself in possession of multiple (three) Z80 processors and a few sticks of RAM and ROM. I have built a working computer with said devices but I have an issue or two or three..hundred..okay, not that many. My issue is actually the (EEP)ROM, or the programming of, specifically. As usual ...
by free-bee
Sun Dec 25, 2016 4:47 pm
Forum: SparkFun Site Questions/Comments
Topic: I don't think this is seven Inches
Replies: 1
Views: 746

I don't think this is seven Inches

I was browsing around and was looking at the 7" LCD screen for the Pi and was reading some of the reviews. I read that the screen itself is very thin so I decided to look at the 3D model. I then decided to play with the model view a little and then: large.png Either Colorado has some really big quar...
by free-bee
Sun Jan 03, 2016 3:53 pm
Forum: SparkFun Product Questions
Topic: Questions about TMP102
Replies: 0
Views: 121

Questions about TMP102

The first question is about how suitable these are to measuring air temperature. The datasheet suggests, to me anyway, that the sensor is targeted for surface readings. I'm attempting open-air readings anyways, which brings me to question two. The board has a bit of drift in it's results. I wired it...
by free-bee
Wed Sep 16, 2015 4:48 pm
Forum: Projects
Topic: Need Help with Project!
Replies: 1
Views: 146

Re: Need Help with Project!

Making the light come on is the easy part. You'll need as little as a microswitch and a light (and wires and a power source but you probably already knew that). It's the sound part that's going to be difficult. Getting the sound files is as easy as downloading (and maybe converting) them. They will ...
by free-bee
Tue Sep 15, 2015 9:03 pm
Forum: SparkFun Product Questions
Topic: Squirrel Cage blower life expectancy
Replies: 2
Views: 282

Squirrel Cage blower life expectancy

In the three years that I owned this blower fan, it never occurred to me to ask what the life expectancy of this blower is. For some reason, I kept thinking that it was short (maybe a year at max). But I've been thinking of various uses for this blower, and realized that I never did know the answer....
by free-bee
Sun Aug 30, 2015 12:55 pm
Forum: Projects
Topic: Magnetic Sensors
Replies: 1
Views: 211

Re: Magnetic Sensors

Possible to alert a specific system or pager? Yes, but I have no experience in this so I do not know how difficult it would be. I guess that would depend on the system you want to alert. Distance measuring with magnets? Sure. But the issue with magnets is that the force they exert on each other chan...
by free-bee
Sat Aug 29, 2015 10:54 am
Forum: Projects
Topic: NE555 Discharge Pin Current
Replies: 5
Views: 732

Re: NE555 Discharge Pin Current

Well I do have a DAC sitting around somewhere that I used to make a lightning generator a while back. I've been thinking about digging it out to use for something, but couldn't think of anything.

I just thought of a good project to make.
by free-bee
Sat Aug 29, 2015 9:04 am
Forum: Projects
Topic: NE555 Discharge Pin Current
Replies: 5
Views: 732

Re: NE555 Discharge Pin Current

I was wanting to avoid using a microcontroller for the sole purpose of turning an LED on for a few hours and back off. Especially since I only have arduino unos (and a basic stamp). It seems like a waste of processing power and etc.
by free-bee
Fri Aug 28, 2015 7:22 pm
Forum: Projects
Topic: NE555 Discharge Pin Current
Replies: 5
Views: 732

NE555 Discharge Pin Current

I need to make a 555 timer monostable circuit with a very long duration. I did some searching for the largest caps I could find on hand and found one that'll be suitable. I pulled up my simulation software and made a quick mock-up. Here is the problem. In my simulator, if I choose a C value that is ...
by free-bee
Sat Aug 15, 2015 7:44 pm
Forum: Projects
Topic: Help Understanding Datasheet; XLS93LC46P
Replies: 0
Views: 204

Help Understanding Datasheet; XLS93LC46P

The XLS93LC46P (<- link to datasheet) is a 1024-bit serial EEPROM. I tried to use the datasheet before in an attempt to interface with it, but I was really confused at the time. I just re-read it and I think I finally figured it out. I just need verification. The datasheet says that the chip is cont...
by free-bee
Sat Aug 08, 2015 10:39 am
Forum: Projects
Topic: Motor Controller
Replies: 3
Views: 349

Re: Motor Controller

I managed to find the PDF: http://cache.freescale.com/files/product/doc/AN1916.pdf 2.1.4 Speed Control Commutation ensures proper rotor rotation of the BLDC motor, while the motor speed depends only on the amplitude of the applied voltage. I figured that if I could build a commutation circuit of onl...
by free-bee
Wed Aug 05, 2015 1:59 pm
Forum: Projects
Topic: Motor Controller
Replies: 3
Views: 349

Motor Controller

A while back, I posted about wanting to make a controller board for a three-phase BLDC motor with Arduino. But then I read a paper stating two things: 1. The speed of the motor depends on the voltage applied to the leads. 2. The torque of the motor depends on the current through the stator coils. So...
by free-bee
Wed Aug 05, 2015 1:24 pm
Forum: Projects
Topic: Is there a button for this?
Replies: 1
Views: 212

Re: Is there a button for this?

You might be trying to describe either a T Flip-Flop or a JK Flip-Flop? JK has three inputs: J, K, Clock. If you wire the push button to the "Clock" pin and tie both the "J" and "K" inputs directly to Vcc, its output will toggle when the button is pressed. The T type has only one input: clock. Be su...