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by deathracer99
Sat Jun 17, 2017 3:58 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Sending TTL pulse from Arduino to Raspberry Pi
Replies: 6
Views: 1397

Re: Sending TTL pulse from Arduino to Raspberry Pi

@burngate I made the changes i.e. added a 2.2kohm resistor and tested the circuit.

I was getting a voltage of 0.67V across Pi's whereas it should be 3.3V. Is there anything that might be the cause of this problem? What is possibly the cause of this?

Thanks again
by deathracer99
Sat Jun 17, 2017 9:04 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Sending TTL pulse from Arduino to Raspberry Pi
Replies: 6
Views: 1397

Re: Sending TTL pulse from Arduino to Raspberry Pi

Thanks for the help. Yep, I was initially planning to put a 1k resistor between emitter and ground.

Also, I am sorry for MB102, had planned on describing it but forgot while writing.
by deathracer99
Fri Jun 16, 2017 4:46 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Sending TTL pulse from Arduino to Raspberry Pi
Replies: 6
Views: 1397

Sending TTL pulse from Arduino to Raspberry Pi

I am trying to send TTL pulse from arduino to 8 raspberry pi simultaneously. I wanted to ask whether circuit to good enough to send TTL pulse to pi and works under currently and voltage limitations. Can someone point out questions if there are any? Here is the image for the circuit https://ibb.co/fp...
by deathracer99
Mon Apr 03, 2017 3:10 am
Forum: Troubleshooting
Topic: Raspberry Pi switching on and off on its own
Replies: 2
Views: 371

Re: Raspberry Pi switching on and off on its own

Ohh I was checking the power levels using multimeter only between PP1 and PP3. The power level showed up as 4.94V, with my sD card and Ethernet cable plugged in.
The pi is powered using 5v/2A adapter via USB.
by deathracer99
Sun Apr 02, 2017 3:02 pm
Forum: Troubleshooting
Topic: Raspberry Pi switching on and off on its own
Replies: 2
Views: 371

Raspberry Pi switching on and off on its own

I have raspberry pi B+ with Jessie OS installed on SD card. My raspberry pi keeps on switching off and on at very frequent interval i.e. even before the main desktop screens shows up, it starts restarting on their own. I initially thought it was some power issue but that is not the case. Followed by...
by deathracer99
Sun Jan 22, 2017 4:32 am
Forum: Camera board
Topic: [SOLVED] Clock on Raspberry Pi camera?
Replies: 4
Views: 1820

Re: Clock on Raspberry Pi camera?

Thanks for all the help!
by deathracer99
Sat Dec 31, 2016 10:20 am
Forum: Camera board
Topic: [SOLVED] Clock on Raspberry Pi camera?
Replies: 4
Views: 1820

Re: Clock on Raspberry Pi camera?

Another question that I had is what is the difference between clock source for camera.frame.timestamp and CLOCK_MONOTONIC . I know that CLOCK_MONOTONIC is affected by adjustment by NTP and camera.frame.timestamp (which closer to CLOCK_MONOTONIC_RAW) is not but what exactly is clock source for them? ...
by deathracer99
Fri Dec 23, 2016 11:22 pm
Forum: Camera board
Topic: [SOLVED] Clock on Raspberry Pi camera?
Replies: 4
Views: 1820

[SOLVED] Clock on Raspberry Pi camera?

I just wanted to confirm a couple of questions. Sorry if these have been asked previously. 1.) Is there a clock on Raspberry Pi camera? Or does Picamera use the Pi board clock? 2.) If there is a clock on the camera, is there a way to get frame acquisition timestamp using that clock? As in is it poss...
by deathracer99
Wed Feb 03, 2016 5:47 am
Forum: Camera board
Topic: [Solved] Significance of MMAL_PARAMETER_SYSTEM_TIME
Replies: 4
Views: 995

Re: Significance of MMAL_PARAMETER_SYSTEM_TIME

Hey Hi, I googled a bit and found out that the Soc you are talking about is the Broadcom BCM2836 which is on the pi board.

But I am still confused about the statement that there is no relatoion between STC and linux time. Pls help?
by deathracer99
Tue Feb 02, 2016 6:49 am
Forum: Camera board
Topic: [Solved] Significance of MMAL_PARAMETER_SYSTEM_TIME
Replies: 4
Views: 995

Re: Significance of MMAL_PARAMETER_SYSTEM_TIME

Thanks for getting back! Soc STC you are talking about is the raspberry pi time and not the camera clock time, right? No direct link between that and Linux time. RAW_STC timestamps gives you timestamps direct off the STC, so grabbing SYSTEM_TIME and a Linux time at the start gives you a delta so you...
by deathracer99
Sun Jan 31, 2016 11:58 am
Forum: Camera board
Topic: [Solved] Significance of MMAL_PARAMETER_SYSTEM_TIME
Replies: 4
Views: 995

[Solved] Significance of MMAL_PARAMETER_SYSTEM_TIME

Hi, I am new to using raspberry pi camera. I am curently using picamera python library to work on it. I was trying to play around a bit for synchronizing multiple pi cameras and came across the MMAL_PARAMETER_SYSTEM_TIME. I wanted to understand the logic behind this time value we get from this. Does...

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