Search found 302 matches

by paulvha
Fri Feb 15, 2019 9:19 am
Forum: SparkFun Product Questions
Topic: GT-521F32 and GT-521F52
Replies: 1
Views: 18

Re: GT-521F32 and GT-521F52

According to the programmers manual (page 19 / 5.11) it will merge the 3 templates/enrollments into 1 template to store. Removing your finger and re-apply in between the enrollments, will hardly ever create exactly the same template, but one with enough overlap between them to create a single versio...
by paulvha
Thu Feb 14, 2019 11:02 am
Forum: SparkFun Product Questions
Topic: Uploading code to LoRa Gateway - 1-Channel (ESP32)
Replies: 3
Views: 30

Re: Uploading code to LoRa Gateway - 1-Channel (ESP32)

lower your speed to connect to the ESP32 board to 230K, maybe even lower depending on the quality of the cable and speed of your USB/system. Also make sure your serial monitor is NOT active.
by paulvha
Tue Feb 05, 2019 12:51 am
Forum: SparkFun Product Questions
Topic: HX711 analog output
Replies: 1
Views: 52

Re: HX711 analog output

NO.. the HX711 only provides digital interface.
by paulvha
Sun Feb 03, 2019 3:59 am
Forum: SparkFun Product Questions
Topic: HX711: VCC and VDD at 3.3V?
Replies: 4
Views: 90

Re: HX711: VCC and VDD at 3.3V?

VCC is the main supply, VDD is for the digital interface. The only thing that I expect that would happen is less sensitive readings as the 24 bit ADC is working with 3v3 (AVDD) instead of 5V.
by paulvha
Fri Jan 18, 2019 1:09 am
Forum: SparkFun Product Questions
Topic: Sparkfun ESP32 Dev Board Uploading
Replies: 4
Views: 82

Re: Sparkfun ESP32 Dev Board Uploading

you have to press the button when the "connecting..." appears on the screen. Once it starts uploading you can release it. Also make sure your serial monitor is closed, otherwise you uploading will fail often.
by paulvha
Thu Jan 17, 2019 10:48 am
Forum: SparkFun Product Questions
Topic: Sparkfun ESP32 Dev Board Uploading
Replies: 4
Views: 82

Re: Sparkfun ESP32 Dev Board Uploading

are you pushing the GPIO0 button on the ESP32 during connecting ? NOT the reset ?
by paulvha
Sun Jan 06, 2019 2:38 am
Forum: Arduino
Topic: blynk iot board
Replies: 1
Views: 51

Re: blynk iot board

by paulvha
Sat Jan 05, 2019 5:43 am
Forum: Projects
Topic: monster moto shield VNH2SP30 and matlab
Replies: 7
Views: 149

Re: monster moto shield VNH2SP30 and matlab

That code will do nothing. look at https://www.sparkfun.com/products/10182, documents-tab, and look for sample code (download directly or on github) It will be a good starting point
by paulvha
Wed Dec 26, 2018 3:00 am
Forum: Arduino
Topic: no device found on com
Replies: 4
Views: 145

Re: no device found on com

is the device really on com6 (as in the first picture) or com7 (where the IDE is looking)
by paulvha
Tue Dec 25, 2018 5:35 am
Forum: SparkFun Product Questions
Topic: Recommendation for RFID hardware for 5-8 tags in a 4-6 inches range
Replies: 1
Views: 43

Re: Recommendation for RFID hardware for 5-8 tags in a 4-6 inches range

An NANO-M6E Sparkfun reader is able to read multiple tags from a distance. A test just done read from a distance of 40 cm with the reader to be set to max read-power (27dbm). on 20dbm it handles around 15 cm. Of course this is also down to the quality of the tags and the position to the (on-board) a...
by paulvha
Tue Dec 25, 2018 1:44 am
Forum: Arduino
Topic: no device found on com
Replies: 4
Views: 145

Re: no device found on com

have you selected in preferences "show verbose output during upload". what errror message do you get ?
by paulvha
Tue Dec 18, 2018 6:16 am
Forum: SparkFun Product Questions
Topic: I can't able to print ASCII output.
Replies: 2
Views: 103

Re: I can't able to print ASCII output.

A Serial.print(char) will show the ASCII sign. e.g. if char c = 0x30, Serial.print(c) will show 0 (zero) . Maybe you need to do typecasting. The data you receive from the driver is 'uint8_t', If uint8_t i = 0x30, so you need to use Serial.print((char) i)
by paulvha
Sun Dec 09, 2018 4:49 am
Forum: Wireless/RF
Topic: esp32Thing crashes.
Replies: 5
Views: 595

Re: esp32Thing crashes.

can you share the code you are using? An ESP32 (like the ESP8266) needs to be perform regular background tasks for onboard WIFI and BLE. If you have a waiting loop, you have to include yield() on a regular basis to prevent the watchdog to timeout and cause a crash. Also you remember the kind of mess...
by paulvha
Mon Dec 03, 2018 12:22 pm
Forum: SparkFun Product Questions
Topic: Using Mercury C API and Universal Reader Assistant with Simultaneous RFID Reader via Arduino shield?
Replies: 13
Views: 189

Re: Using Mercury C API and Universal Reader Assistant with Simultaneous RFID Reader via Arduino shield?

pin 0 and 1 on the shield are ALSO connected to the UART/USB connection. On the Arduino pin 0 and 1 are also connected to the USB (for Arduino). When you put the switch to HW, which you have to do to communicate using the UART/USB, you get a conflict. Make sure that Pin 0 and 1 are NOT connecting to...