Search found 253 matches

by paulvha
Fri Oct 12, 2018 12:50 am
Forum: SparkFun Product Questions
Topic: Cut power to TLC5940 => LEDs turn on
Replies: 3
Views: 83

Re: Cut power to TLC5940 => LEDs turn on

why don you put a single switch on the +9V from the battery?
by paulvha
Tue Oct 09, 2018 9:36 am
Forum: Arduino
Topic: How to monitor state of 50 Digital Inputs
Replies: 1
Views: 135

Re: How to monitor state of 50 Digital Inputs

I would look at https://www.sparkfun.com/products/13601. These boards can handle up to 16 inputs. They connect over I2C to the processor and each has it's own I2C address. The interesting part is that each board has an INT-line which will trigger low when any of the 16 inputs change. The processor o...
by paulvha
Sun Oct 07, 2018 2:16 am
Forum: Wireless/RF
Topic: RFID USB Reader [SEN-09963]
Replies: 1
Views: 65

Re: RFID USB Reader [SEN-09963]

Does not look like that as the data sheet of the ID12/20SMD states 5V. The ID12LA has a wider voltage range ( https://www.sparkfun.com/products/11827)
by paulvha
Sat Sep 29, 2018 2:39 am
Forum: Projects
Topic: [Help] Read magnetic encoder
Replies: 2
Views: 47

Re: [Help] Read magnetic encoder

RS422 is NOT the same as RS232 and you need additional hardware to connect. A good article is https://www.omega.co.uk/techref/das/rs-232-422-485.html. SSI is based on RS422 (https://en.wikipedia.org/wiki/Synchronous_Serial_Interface) and BISS is compatible with SSI. I assume the reason to use RS422 ...
by paulvha
Mon Sep 24, 2018 12:14 am
Forum: SparkFun Product Questions
Topic: Current for backlight of LCD-00710 display
Replies: 1
Views: 49

Re: Current for backlight of LCD-00710 display

According to https://tronixstuff.com/tag/lcd-00710/, they mention :LCD uses 20mA with the backlight off and 160mA with it on. That is about the same what I have seen on other displays as well for the backlight 120mA - 150 mA
by paulvha
Thu Sep 20, 2018 8:28 am
Forum: Projects
Topic: Bad characters while communication over serial port
Replies: 2
Views: 81

Re: Bad characters while communication over serial port

the "real" serial port on Pi3 is set by default to communicate to the on-board bluetooth. Make sure to disable. There are many articles around that e.g. see https://spellfoundry.com/2016/05/29/con ... ding-pi-3/

regards,
Paul
by paulvha
Mon Sep 17, 2018 5:18 am
Forum: SparkFun Product Questions
Topic: SGP30 Sensor and Ethanol
Replies: 1
Views: 46

Re: SGP30 Sensor and Ethanol

look at https://www.sensirion.com/en/download-center/gas-sensors/multi-pixel-gas-sensors/. Download the embedded driver for SGP30. It has sample code for reading the values. in the file sgp30_example_usage.c it indicates how to get the ethanol values. For contact use : https://developer.sensirion.co...
by paulvha
Thu Sep 13, 2018 8:20 am
Forum: Wireless/RF
Topic: RF Remote to Receiver >Arduino for Scoreboard
Replies: 3
Views: 151

Re: RF Remote to Receiver >Arduino for Scoreboard

normally each button on a remote has a unique code that can consist of multiple bytes. You can add a little code to read and check which unique code was received and update you scoreboard ( e.g. add 1 or 10, or subtract 1 or 10 etc).
by paulvha
Thu Sep 06, 2018 9:49 pm
Forum: Wireless/RF
Topic: Wirelss/RF For Thousands of Devices
Replies: 1
Views: 206

Re: Wirelss/RF For Thousands of Devices

Have a look at LORA. This is a network solution that is gaining momentum. It is mend for large scale of sensors with low energy use and can run on battery for longer time (https://www.thethingsnetwork.org/)

regards,
Paul
by paulvha
Tue Sep 04, 2018 11:58 pm
Forum: SparkFun Product Questions
Topic: scd30 on Android Things
Replies: 1
Views: 77

Re: scd30 on Android Things

having worked to get the SCD30 working on an ESP32, I know that this device is using clockstretching, which must be enabled from/before the first communication with the device. The Arduino is handling that by default, the ESP32 has a I2c software implementation where the clock stretch time-out can b...
by paulvha
Tue Aug 28, 2018 1:04 pm
Forum: Wireless/RF
Topic: esp32Thing crashes.
Replies: 3
Views: 283

Re: esp32Thing crashes.

the ESP32 is working on 3V3. Are you providing 5V on the battery connection or the USB?
by paulvha
Mon Aug 27, 2018 12:44 am
Forum: SparkFun Product Questions
Topic: Sparkfun RTC DS1307
Replies: 1
Views: 86

Re: Sparkfun RTC DS1307

the later.. just add 20...
by paulvha
Wed Aug 22, 2018 12:33 am
Forum: SparkFun Product Questions
Topic: BOB-12009 3.3v to/from 5v
Replies: 1
Views: 107

Re: BOB-12009 3.3v to/from 5v

This could be used turn the ouput signal (max 5V) from the DHT22 to the ESP (max 3V3). As it only one data line, you could also make a voltage divider with 2 resistors or you can use the DHT22 on 3v3,

The HV looks to be max 50V and the LV ~20V ( but this based on the used BSS138 data sheet)
by paulvha
Fri Aug 17, 2018 3:49 am
Forum: Projects
Topic: Switching mains with a Raspberry [PHOTO]
Replies: 1
Views: 149

Re: Switching mains with a Raspberry [PHOTO]

others tried as well and had success with some different values : https://electronics.stackexchange.com/questions/345845/triac-not-getting-switched-by-optoisolator. Another one needs translation (with chrome?) : http://panamahitek.com/herramienta-de-control-para-arduino-el-triac-conmutador-para-corr...
by paulvha
Mon Aug 13, 2018 9:29 am
Forum: Wireless/RF
Topic: ESP8266 serial AT in Korean
Replies: 2
Views: 207

Re: ESP8266 serial AT in Korean

Might the "Korean" be the fact that you have the wrong baudrate on terminal emulator? E.g. 115200 instead of 9600 or the other way around ? or maybe you do not have 8bit, 1 stop and NO parity?