2018-05-05 (Sa) Weekly Summary

Episode 043 was about cerebrolysin, a potent nootropic which was supposed to help regrow brain cells which don’t regenerate much in older humans. It had a lot of benefits to people who had suffered a loss of mental ability, but it also boosted stock humans above their natural limit. Very cool. There are two reasons cerebrolysin isn’t used more. Firstly, the FDA hasn’t approved it despite its widespread use in other countries. Secondly, it must regularly be injected over the course of treatment. Tim and I focused a lot on the mentality of having to self-inject cerebrolysin.

Here is our unedited video recording of episode 49 and here is the show page for the edited podcast with episode 049.
Brian - Left _____ Tim - Right

Once the most useful boards were designed, some of the specialty boards were designed. These boards will allow configurations other than standard keyboards or they allow standard keyboards to be designed with minimal PCB real estate.

Specialty boards designed in EDA

The first shipment of boards arrived and they were populated. In the case of the controller board, only a socket was necessary. Female header pins were soldered to accept a Teensy-LC. Jumper pins were used to select which I2C line went to the pins on either side of the board.

First controller board with soldered headers

After the boards were ordered, it became evident that pull-up resistors on the I2C data lines were necessary. The next revision of boards would include surface-mount resistors for this, but ordinary axial resistors were soldered across the necessary terminals before then.

Pullup resistors on communication pins, SDA and SCL

Like the data lines on the controller board, the RESET pin on the IO expander board needed to be pulled high as well. Pulling the pin high could have been done with a wire, but a resistor was used so that it could be pulled low, which would cause the board to reset.

Pullup resistor on the RST pin

HaD has three basic types of publications. There are the dailies, which are the majority of what gets published. These are the two to four paragraph blurbs about cool things people have done. There are also longer articles which are part of a series, like Hackaday Links which contains a lot of neat projects which didn’t warrant a full article. Lastly, there are original content articles which are unique because they are often written in the first person, although that’s not a requirement. I don’t write them often. This one was a biohacking article about stripping the cells away from plant or animal tissue which leaves a ghostly version of the original tissue behind. It was a fun article to write about processes I’d seen before. Strangely, it hadn’t been covered on Hackaday before this.

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