Search found 2220 matches

by jremington
Sat Sep 15, 2018 8:46 am
Forum: SparkFun Product Questions
Topic: Pocket Geiger Radiation Sensor - Type 5
Replies: 1
Views: 33

Re: Pocket Geiger Radiation Sensor - Type 5

The sensor does no data processing. It simply sends a signal when an event occurs, i.e. a gamma photon has been captured.

What types of radiation do you want to detect? This sensor is very limited and is most sensitive to low energy gamma photons (usually called X-rays).
by jremington
Mon Sep 10, 2018 8:47 am
Forum: SparkFun Product Questions
Topic: Temperature Sensor with Sound
Replies: 1
Views: 36

Re: Temperature Sensor with Sound

For "circuitry" you will need a microprocessor, with a display, pushbuttons and a buzzer.
Pololu makes just such items in a single, small package. https://www.pololu.com/product/1227

Plenty of Arduino code is available on the web to read the temperature sensor, display values, read pushbuttons, etc.
by jremington
Sun Sep 09, 2018 7:42 pm
Forum: Arduino
Topic: Trouble with my AVR MK II
Replies: 6
Views: 184

Re: Trouble with my AVR MK II

I suggest to post on the Microchip forum.
by jremington
Sun Sep 09, 2018 5:17 pm
Forum: Projects
Topic: Can I use these, for this?
Replies: 2
Views: 53

Re: Can I use these, for this?

The charger will charge LiPo batteries, which you could then put in your phone. The charger will not talk to the phone.
by jremington
Sun Sep 09, 2018 5:13 pm
Forum: Arduino
Topic: Trouble with my AVR MK II
Replies: 6
Views: 184

Re: Trouble with my AVR MK II

Sounds like a driver problem to me. I use Win7 with the AVRISP MKII programmer, and no COM port appears when it is plugged in. I use AVR Studio for programming with it, not Arduino. In Device Manager the programmer appears under the "Jungo" heading as two devices: AVRISP mkII and WinDriver. Try down...
by jremington
Tue Sep 04, 2018 5:39 pm
Forum: General Chit Chat
Topic: Can this be used as I2C Master?
Replies: 4
Views: 223

Re: Can this be used as I2C Master?

I figure there has to be some Why? Processors are dirt cheap . Even a six pin PIC10F200 processor can do everything that is required to handle a typical dumb sensor, for $0.31. So why should the sensor be smart? Furthermore, if your design requirements change, standard processors are reprogrammable...
by jremington
Mon Sep 03, 2018 1:24 pm
Forum: General Chit Chat
Topic: Can this be used as I2C Master?
Replies: 4
Views: 223

Re: Can this be used as I2C Master?

In this case the Bluetooth is a slave and I2C (instead of the UART) is used by a processor to send and receive Bluetooth transmissions.

You also need a processor to read a sensor, format and send the data to the Bluetooth module.
by jremington
Mon Sep 03, 2018 8:38 am
Forum: Arduino
Topic: H3LIS331DL Accelerometer Inaccurate Values
Replies: 1
Views: 83

Re: H3LIS331DL Accelerometer Inaccurate Values

All accelerometers produce noise. The question is: is the noise you are seeing significant? What "g" values do those numbers represent? It is very difficult to properly test a 100 g to 400 g accelerometer, so if the noise values do not exceed the maximum given in the data sheet, then the answer is n...
by jremington
Sun Sep 02, 2018 8:45 am
Forum: SparkFun Product Questions
Topic: Problem with Euler Angles on 9DoF Razor IMU
Replies: 1
Views: 59

Re: Problem with Euler Angles on 9DoF Razor IMU

You should read the comments on the product page. Basically, the DMP firmware in this sensor is useless for most serious applications, unless you are willing to put a lot of work into it. The firmware in the BNO055 module works somewhat better, but is also rather primitive. A much better approach is...
by jremington
Fri Aug 31, 2018 7:58 am
Forum: Arduino
Topic: How to Interface Arduino UNO with Raspberry Pi
Replies: 1
Views: 75

Re: How to Interface Arduino UNO with Raspberry Pi

First, figure out how to control motors using the Arduino, and make sure that works properly. Then, figure out to use sensors with the Raspberry Pi. Finally, decide how you want the Pi to communicate with the Arduino, and what information is to be passed. You will need a 3.3V to 5V level shifter for...
by jremington
Thu Aug 30, 2018 8:06 am
Forum: Projects
Topic: Hall Sensor Signal Conditioning
Replies: 9
Views: 141

Re: Hall Sensor Signal Conditioning

That single-ended supply approach won't work for the general case, because the op amp can't output a negative voltage.
You will need split power supplies, if you want to subtract off the sensor midpoint voltage before amplification.

What, exactly, do you want to do?
by jremington
Mon Aug 27, 2018 10:05 am
Forum: SparkFun Product Questions
Topic: BME280 and Changing Altitude Value
Replies: 3
Views: 107

Re: BME280 and Changing Altitude Value

1. "Frequently" depends on whether the atmospheric pressure is changing. Sometimes it doesn't, for days on end. You can verify this using your own equipment.

2. Yes. Airports and most weather reports state the local air pressure, corrected to sea level for just that reason.
by jremington
Mon Aug 27, 2018 7:30 am
Forum: Arduino
Topic: Supplying Arduino Pro Mini 3.3V
Replies: 5
Views: 137

Re: Supplying Arduino Pro Mini 3.3V

Estimate battery lifetime from the battery capacity, measured in Ah (Ampere hours) or mAh (milliAmpere hours), divided by the average current draw in A or mA, respectively. If you use a switching step down converter on the lead acid battery, it will draw less current from the battery than the circui...
by jremington
Sun Aug 26, 2018 12:30 pm
Forum: General Chit Chat
Topic: Heat Index Controller (Temp/Hum controller)
Replies: 1
Views: 163

Re: Heat Index Controller (Temp/Hum controller)

Google "arduino dht11" for a large number of tutorials.
by jremington
Fri Aug 24, 2018 12:37 pm
Forum: SparkFun Product Questions
Topic: Openscale returning negative values?
Replies: 2
Views: 113

Re: Openscale returning negative values?

You may be confusing an unsigned integer with a signed one.