FPGA based OV7670 – Image segmentation

As I mentioned in my last post, I wanted to try some image segmentation! I had a quick go at histogram based segmentation where the largest peak of the histogram was used to find the most occuring pixel (after the colour range was bit crushed) but this didn’t have particularly useful results. This could be […]

FPGA based OV7670 – Edge Detection

One of the staples of image processing is edge detection. Edge detection is generally one of the primary steps for further image processing methods including feature detection. Conceptually, edge detection is relatively simply. Look at the image and compare areas of low intensity to areas of high intensity, simple right? Actually yeh, it is that […]

FPGA + OV7670 = Super slow UART webcam

What do you get when you combine an FPGA with some SDRAM and an OV7670 camera, transferring uncompressed frames through UART? Really poor performance, reliability and a pretty useless end product… Though just because it sucks that doesn’t mean it isn’t worth doing! I’ve had my first exam and I’ve wanted to crack on with […]

FPGA based Mandlebrot set generator

Mandlebrot Set Generator As I said in my last post, I implemented a Mandlebrot set generator in my STM32. Even though it was running at 64MHz, generating the set took a fair bit of time, slow enough to not even maximise the fully available SDRAM capacity at the time. At this point, I decided to […]

Anthrophex – New Controller Board

So today has been exceptional! I’ve made loads of progress with thanks to the arrival of my new components. As was stated previously, there were way too many losses in the gate shift registers using the 4x 1k resistor arrays. Therefore, I needed to replace the arrays for 1k resistors to the gate (maximum output […]

Anthrophex – Update 3/5/17

(Its now 4/5/17 shhhh) Frame So last night I was in the hackspace testing out my new hinges and moved actuator. Sadly, the hinges once again were too weak to fully support my weight (ugh) so it’s made me rethink the design of each leg. I am however going to keep the hinges for now […]

Anthrophex – Controller board 2

After the faults with controller board 1, I wanted to respin another controller board ASAP. These boards arrived yesterday and with a swift order from RS, so did a load of components! On the previous board, I was using a large STM32 device with many pins and driving the motors directly through level shifter chips. […]

Anthrophex – Linear actuator feedback

Obviously having feedback for each of the linear actuators is a pretty big requirement (though not essential realistically for the leg lifting actuators), therefore a fair bit of through needs to go into this section. I was originally going to use flex sensors on the joints to measure the angle of each joint but after […]

Anthrophex: Part 2 – The build

I guess now would be a good time to disclaim my machining abilities. I can safely say that I’d make a shocking machinist but I guess its the effort that counts right? Regardless, with the arrival of parts, the build could begin! The leg and hip hinges As all of the aluminium was pre cut […]