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by Bruce_Pi
Mon Jun 11, 2018 5:25 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Wiring multiple i2c together
Replies: 6
Views: 392

Re: Wiring multiple i2c together

did you check the pull ups ?
I2C wont work untill you pull SDA and SCL lines high. A 4.7K will be a good choice.
by Bruce_Pi
Mon Jun 04, 2018 2:27 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: (solved)pi 3 B+ killing the I2C shield
Replies: 21
Views: 1044

Re: pi 3 B+ I2C shield killing the Pi

so the issue is with pi 3B+ 3.3V. i used an external regulator to supply 3.3V and it started to boot without any issue.
someone from pi hardware team needs to look into pi3B+ 3.3V power supply ratings.

there are few other people on the forums who are facing the similar issue with new pi 3B+.
by Bruce_Pi
Mon Jun 04, 2018 2:22 pm
Forum: HATs and other add-ons
Topic: PI3B+ not work when powered by GPIO pins
Replies: 6
Views: 1086

Re: PI3B+ not work when powered by GPIO pins

i had the same issue with pi 3b+ 3.3v.
viewtopic.php?f=44&t=214713
the pi 3B+ 3.3V regulator has some issues. I was testing an i2c shield with it and pi wont boot up.
I have used ths i2c shield with all other pi models without any issue.
by Bruce_Pi
Mon Jun 04, 2018 2:18 pm
Forum: HATs and other add-ons
Topic: Please build a better Relative Humidity Sensor
Replies: 7
Views: 1325

Re: Please build a better Relative Humidity Sensor

I will recommend looking into honeywell temp humidity sensor. something like HIH6130 https://store.ncd.io/product/hih6130-humidity-and-temperature-sensor-%C2%B14-rh-%C2%B11-0c-i2c-mini-module/ the temp/humidity reading are extremely accurate and they are temp compensated. These sensors are i2c based...
by Bruce_Pi
Wed May 30, 2018 9:35 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: (solved)pi 3 B+ killing the I2C shield
Replies: 21
Views: 1044

Re: pi 3 B+ I2C shield killing the Pi

it can do
Allows Voltage-Level Translation Between
– 1.2-V VREF1 and 1.8-V, 2.5-V, 3.3-V,
or 5-V VREF2
– 1.8-V VREF1 and 2.5-V, 3.3-V, or 5-V VREF2
– 2.5-V VREF1 and 3.3-V or 5-V VREF2
– 3.3-V VREF1 and 5-V VREF2

anywhere from 1.2V to 5V.
by Bruce_Pi
Wed May 30, 2018 4:05 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: (solved)pi 3 B+ killing the I2C shield
Replies: 21
Views: 1044

Re: pi 3 B+ I2C shield killing the Pi

level shifter is PCA9306

http://www.ti.com/lit/ds/symlink/pca9306.pdf

as i mentioned earlier this shield works fine with all other Pi models.
by Bruce_Pi
Wed May 30, 2018 2:11 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: (solved)pi 3 B+ killing the I2C shield
Replies: 21
Views: 1044

Re: pi 3 B+ I2C shield killing the Pi

the power supply is a BK precision variable power supply and can deliver upto 5A. I am suspecting the 3.3V regulator on the Pi is not big enough to deliver any current ( the i2c board has a level shifter which consumes 10mA @3.3V) Update : if i plug the i2c shield after pi boot up if works fine, i a...
by Bruce_Pi
Tue May 29, 2018 1:42 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: (solved)pi 3 B+ killing the I2C shield
Replies: 21
Views: 1044

(solved)pi 3 B+ killing the I2C shield

Hi, I have a this i2c shield https://store.ncd.io/product/i2c-shield-for-raspberry-pi-3-pi2-with-outward-facing-i2c-port-terminates-over-hdmi-port/ in past i have used this shield with Pi 2,3 pi zero and it has been working great. recenelty i purchased a new Pi3 B+ and when i plug the i2c shield, th...
by Bruce_Pi
Mon Apr 30, 2018 5:59 pm
Forum: General discussion
Topic: recommendations for USB-DAC?
Replies: 4
Views: 285

Re: recommendations for USB-DAC?

You can use an i2c dac with an usb to i2c converter.
Something like this
usb to i2c
https://store.ncd.io/product/usb-to-i2c ... t-ft230xs/
and a i2c DAC
https://store.ncd.io/?fwp_product_type= ... converters
by Bruce_Pi
Mon Apr 30, 2018 4:55 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: DAC for 0 - 10v output
Replies: 8
Views: 8784

Re: DAC for 0 - 10v output

@natopal46 the i2c chip you mentioned is digital IO expander NOT a DAC. To get a analog output you will need to use a DAC not io. there aren't many DAC chips which outputs 0-10V, most of these outputs 0-5V. You will need build a amplifier with gain set to two. If you are not sure how to build or don...
by Bruce_Pi
Fri Apr 06, 2018 3:21 pm
Forum: Beginners
Topic: Xbee Connection with 4-20 MA with RASPBERRY PI interfacing
Replies: 2
Views: 200

Re: Xbee Connection with 4-20 MA with RASPBERRY PI interfacing

If you want to use a resistor to read 4-20mA you will need an analog to digital converter as well. as you know raspberry pi doesn't have any ADC inputs. You can get an i2c ADC board. Once you have these all you will need to do is install resistor in the shut position and read the ADC values. If you ...
by Bruce_Pi
Mon Aug 07, 2017 3:17 pm
Forum: Beginners
Topic: MQ135 with digital output
Replies: 2
Views: 882

Re: MQ135 with digital output

MQ135 provided voltage output and raspberry pi doesn't have any ADC pins so you will need an Analog to digital converter in between raspberry pi and MQ135 sensor. you can also use this MQ135 sensor board it has on board ADC and it will connect to raspberry pi through I2C and will provide and the dig...
by Bruce_Pi
Thu Aug 03, 2017 3:29 pm
Forum: General discussion
Topic: RS485 Shield v3 - need help
Replies: 1
Views: 491

Re: RS485 Shield v3 - need help

what kind of RS485 shield are you using? does it handle the data direction( read/write) or it's just an RS485 UART hardware chip? if you have something like this https://shop.controleverything.com/collections/all/products/rs-485-node-serial-network-communications-module all you will need to do is re...
by Bruce_Pi
Thu Feb 23, 2017 4:54 pm
Forum: HATs and other add-ons
Topic: PIFACE RELAY PLUS
Replies: 6
Views: 1851

Re: PIFACE RELAY PLUS

You can look into an I2C relay shield with a solid state relay controller. something like this https://shop.controleverything.com/collections/relay-controller if you are using this to control pump I will suggest going with a solid state relay controller. the main advantage of using off-board solid s...
by Bruce_Pi
Thu Feb 23, 2017 4:16 pm
Forum: HATs and other add-ons
Topic: ADS1115 problem
Replies: 1
Views: 930

Re: ADS1115 problem

when nothing is connected to the ADC it will give your random values due to noise. so if you want to use it in a differential way make sure you have the input connected on both channels. ADS1115 have lot of parameters which you need to set before you can use if properly( like gain, resolution, diffe...
by Bruce_Pi
Tue Feb 21, 2017 10:53 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Short range I2C woes
Replies: 24
Views: 3446

Re: Short range I2C woes

NXP makes a chip called P82B715TD. it can extend your i2c cable length up to 100 feet. its a very simple chip and you will install one chip on the raspberry pi side and another one on the device side. the max I2C freq supported by this P82B715TD is 400K. if you are looking a before a breakout board ...
by Bruce_Pi
Tue Feb 21, 2017 5:21 pm
Forum: HATs and other add-ons
Topic: Grove pi nescesary for grove sensors?
Replies: 3
Views: 2073

Re: Grove pi nescesary for grove sensors?

if you are looking into the raspberry pi plug and play I will suggest check out this video. https://www.youtube.com/watch?v=CpDiqIycMOk&t=13s this video shows how you can connect hundreds plug and play device with raspberry just with a cable and all these devices use I2C communication. so you can da...

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