0

April 15, 2016 AT 4:36 pm

Troubleshooting I2C for #Arduino, nRF51822

Sometimes makers write in with similar requests to something another maker has attempted to resolve or troubleshoot. It’s in that vein we find ourselves pointing them to this article by bitknitting ‘On BLE, nobody knows if sensor readings are from an nRF51822 or an Arduino.’

i2ctest_arduino_nrf51dk

logicanalyzeri2cnrf51

The goal of this post is to transmit data over the I2C interface. Confirmation that the data was transferred will be output of the SDA/SCL lines when my Saleae Logic Analyzer is inserted between the I2C slave (I will be using Adafruit’s ADS1015 BoB…it could be any I2C chip at this point, I just needed a destination to transmit data to).

I used the same setup to simulate pH voltage (b) values as I did when I first started testing the pH circuit. The other components in the test include Adafruit’s ADS1015 BoB (a) to provide the ADC conversion of the voltage into a digital value that is read from either an Arduino (c) or nRF51 (d) DK over i2c.

Getting I2C traffic to work with the nRF51 SDK was similar to getting most apis I have been clueless about. Unfortunately, while Nordic provides pretty good developer support, there is not the “geez this is easy let’s do it this weekend” type of tutorials that abound for the Arduino. Getting out of the clueless state when it came to accessing I2C took longer than it might…of course, some of the cluelessness is innate to me.

Read more.


Featured Adafruit Products!

NewImage

ADS1015 12-Bit ADC – 4 Channel with Programmable Gain Amplifier: For microcontrollers without an analog-to-digital converter or when you want a higher-precision ADC, the ADS1015 provides 12-bit precision at 3300 samples/second over I2C. The chip can be configured as 4 single-ended input channels, or two differential channels. As a nice bonus, it even includes a programmable gain amplifier, up to x16, to help boost up smaller single/differential signals to the full range. We like this ADC because it can run from 2V to 5V power/logic, can measure a large range of signals and its super easy to use. It is a great general purpose 12 bit converter. Read more.


Check out all the Circuit Playground Episodes! Our new kid’s show and subscribe!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground”Adafruit’s Apps!


Maker Business — Lessons Learned Scaling Airbnb 100X

Wearables — Start with a sketch

Electronics — When do I use X10?

Biohacking — Project Peri – Translates Sound into Light for the Hearing Impaired

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.