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by henryhunt
Fri Sep 07, 2018 2:39 pm
Forum: Camera board
Topic: Overly saturated colours around sunset/low light
Replies: 2
Views: 504

Overly saturated colours around sunset/low light

I have a Raspberry Pi camera module from Waveshare (think it's the V1 camera module) which I am using as a 'cloudcam' pointed at the sky outside, in an enclosure, taking images every 5 minutes. In the 20 minutes before and after sunset, images from the camera show overly saturated colours, making it...
by henryhunt
Thu Aug 30, 2018 2:53 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Random values on unconnected MCP3008 channels, does chip need replacing?
Replies: 5
Views: 548

Re: Random values on unconnected MCP3008 channels, does chip need replacing?

aBUGSworstnightmare wrote:
Thu Aug 30, 2018 2:51 pm
An ADC with floating input will pick-up noise.
Ah, yes I have a feeling this is the reason and there is no actual problem. I just wasn't sure from the last time I used the chip whether the same thing happened. Thanks for confirming.
by henryhunt
Thu Aug 30, 2018 2:52 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Random values on unconnected MCP3008 channels, does chip need replacing?
Replies: 5
Views: 548

Re: Random values on unconnected MCP3008 channels, does chip need replacing?

Would you get more predictable results if you tied the unused inputs to a fixed logic High or Low reference point? Maybe you are simply picking up 'noise'? (Yes, tricky if you have delegged the chip... ) Would I do that by simply routing them to ground or 3.3V, or do they have to go to a GPIO pin i...
by henryhunt
Thu Aug 30, 2018 2:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Random values on unconnected MCP3008 channels, does chip need replacing?
Replies: 5
Views: 548

Random values on unconnected MCP3008 channels, does chip need replacing?

I'm using only one of the 8 channels on the MCP3008 ADC chip, to read a wind direction sensor. I have noticed some odd behaviour on the other channels and just wanted to check if this is normal, or if the chip should be replaced because it could mean the channel I am using is also compromised. After...
by henryhunt
Tue Jul 31, 2018 10:49 pm
Forum: HATs and other add-ons
Topic: Looking for a converter for 230V > 12V and 12V > 5V
Replies: 4
Views: 896

Re: Looking for a converter for 230V > 12V and 12V > 5V

That's exactly what I was looking for, thanks!
by henryhunt
Mon Jul 30, 2018 1:34 pm
Forum: HATs and other add-ons
Topic: Looking for a converter for 230V > 12V and 12V > 5V
Replies: 4
Views: 896

Looking for a converter for 230V > 12V and 12V > 5V

I'm building a weather station that consists of a raspberry pi (with connected sensors) and an additional sensor powered from its own 12V supply. Currently (in an unfinished state) the setup I have is a simple mains-powered (230V) power strip in the enclosure, with the respective 12V and 5V transfor...
by henryhunt
Sat Apr 21, 2018 12:34 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Sporadic large bursts of false pulses from all interrupt/pulse output sensors
Replies: 0
Views: 143

Sporadic large bursts of false pulses from all interrupt/pulse output sensors

I have just finished upgrading a weather station I am building, and have found that all of the sensors that send pulses to convey their data, which is read by interrupts in the python software (the rainfall and wind speed sensors) encounter sporadic bursts of very large amounts of false pulses at th...
by henryhunt
Mon Apr 16, 2018 1:02 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Simple circuit to read output from sensor with separate power supply not working
Replies: 2
Views: 286

Re: Simple circuit to read output from sensor with separate power supply not working

@scotty101 The sensor has a 'Com' input for common ground. If I cut the ground wire from the raspberry pi power supply and wire it into the Com input, would that work? So the 5V power to the raspberry pi would still be coming from its own power supply, but the ground of it would go to the 'Com' on t...
by henryhunt
Mon Apr 16, 2018 12:34 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Simple circuit to read output from sensor with separate power supply not working
Replies: 2
Views: 286

Simple circuit to read output from sensor with separate power supply not working

I have a sunshine duration sensor from Instromet, which operates on its own 12V power supply. It produces a 5V output signal as long as it is sunny (and 0V otherwise). I'm having trouble understanding how to connect this to the Pi and read its 5V output. The circuit I currently have can be seen in t...
by henryhunt
Thu Apr 12, 2018 7:44 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Reading output from sensor with a separate power supply
Replies: 2
Views: 473

Re: Reading output from sensor with a separate power supply

@FTrevorGowen Your response was very helpful, thank you. If I understand you correctly, the single 5V output line needs to converge with the negative wire of the separate 12V power supply after being read by the RPi, so it feeds back and completes the circuit. I have just had another look at the sen...
by henryhunt
Thu Apr 12, 2018 11:09 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Reading output from sensor with a separate power supply
Replies: 2
Views: 473

Reading output from sensor with a separate power supply

I am familiar with sensors like the DS18B20 that have a positive and negative wire, as well as a data wire. This makes sense, since no matter whether the current goes through the data or ground wire, it always ends up at the same point (ground) in the same circuit. However, I now have a sunshine sen...
by henryhunt
Tue Apr 10, 2018 11:57 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Best way to shift 5V down to 3.3V for GPIO pin
Replies: 5
Views: 2326

Re: Best way to shift 5V down to 3.3V for GPIO pin

scotty101 - It seems like a voltage divider would be best here. However, I never understand what is meant when people talk about being sure voltages will not be higher than they expect. Surely if a device says it will output 5V, it will just do that? Why would it be any higher? Or is that what you m...
by henryhunt
Tue Apr 03, 2018 12:42 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Best way to shift 5V down to 3.3V for GPIO pin
Replies: 5
Views: 2326

Best way to shift 5V down to 3.3V for GPIO pin

I can see this question has been asked multiple times around the internet (and here), however I have come across so many methods, solutions and component values, and I am not advanced enough with electronics to decide for my specific situation. I have a sunshine duration sensor that simply outputs a...
by henryhunt
Sun Mar 18, 2018 8:13 pm
Forum: Automation, sensing and robotics
Topic: Possibility of reading Apogee SB-100 sensor with Raspberry Pi
Replies: 4
Views: 718

Re: Possibility of reading Apogee SB-100 sensor with Raspberry Pi

Thank you for your replies (and apologies for my late one). So it seems it is just as easy to read as any other sensor then? I am still concerned about the ability to read individual millivolt scale signals. I have read that this is difficult for a raspberry pi because millivolts are so small, and n...
by henryhunt
Sat Mar 03, 2018 2:15 pm
Forum: Automation, sensing and robotics
Topic: Possibility of reading Apogee SB-100 sensor with Raspberry Pi
Replies: 4
Views: 718

Possibility of reading Apogee SB-100 sensor with Raspberry Pi

I'm looking to upgrade the barometric pressure sensor on a weather station project I am working on (using a Raspberry Pi), and am looking for some advice on if, and how, a certain sensor I have picked out can be read by it. The sensor I'm hoping to use is the SB-100 from Apogee Instruments ( https:/...
by henryhunt
Mon May 15, 2017 12:53 pm
Forum: Camera board
Topic: Typical file size for JPEG image from V2 module
Replies: 2
Views: 613

Typical file size for JPEG image from V2 module

I'm looking to upgrade my raspberry pi storage with the view that I may add a camera module v2 at some point. I'd like to know what kind of average file sizes I would be looking at for a single, JPEG still image (8 megapixels, 3280 × 2464) from that module so I can look at how much storage I would n...
by henryhunt
Sun Jan 08, 2017 5:36 pm
Forum: General discussion
Topic: Looking for waterproof wi-fi antenna on short cable for RPi
Replies: 3
Views: 1096

Looking for waterproof wi-fi antenna on short cable for RPi

I'm building a weather station using a raspberry pi (the very first version), which collects data from an arduino and uploads it to a database on my website. Currently, a long network cable runs from the pi to the nearest ethernet socket inside the house and I'd now like to replace this with a wirel...

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