Search found 854 matches

by ag123
Sat Feb 17, 2018 3:58 pm
Forum: Projects
Topic: Lightpen
Replies: 5
Views: 149

Re: Lightpen

my guess is that a photo-transistor may be sufficiently sensitive to trigger a logic 0 or 1 with things like: vcc|----photo_transistor-----+-----resistor---------|gnd ^-- and we simply feed this to the gpio pin what may be needed is to shield it from 'stray' light then we can possibly 'draw a patter...
by ag123
Sat Feb 17, 2018 3:36 pm
Forum: Projects
Topic: STM32F1/F4 3d Printer board. Worth a kickstarter?
Replies: 17
Views: 553

Re: STM32F1/F4 3d Printer board. Worth a kickstarter?

imho for now some 'public domain' or open sourced slicers mainly produce g-codes that basically breaks curves and angular joints perhaps into straight lines. my guess is that most of the commands would be 'simple' commands that's intended to complete a 'straight line' manoeuvre. The breaking into st...
by ag123
Thu Feb 15, 2018 3:18 am
Forum: Projects
Topic: STM32F1/F4 3d Printer board. Worth a kickstarter?
Replies: 17
Views: 553

Re: STM32F1/F4 3d Printer board. Worth a kickstarter?

common g-codes apparently simply use integers https://www.simplify3d.com/support/articles/3d-printing-gcode-tutorial/ however, if the controller board does movement optimization across a series of g-codes, my guess is it can do a lot of calculations for the acceleration, constant speed, deceleration...
by ag123
Wed Feb 14, 2018 5:51 pm
Forum: Projects
Topic: STM32F1/F4 3d Printer board. Worth a kickstarter?
Replies: 17
Views: 553

Re: STM32F1/F4 3d Printer board. Worth a kickstarter?

i think there'd still be a mkt for the 'board only' attempt, but then the target crowd would be those who have an existing printer & wanted to swap the controller for something else, even if it is somewhat pricier there may still be buyers given the correct niche, some may simply want to replace 16 ...
by ag123
Wed Feb 14, 2018 7:59 am
Forum: Projects
Topic: STM32F1/F4 3d Printer board. Worth a kickstarter?
Replies: 17
Views: 553

Re: STM32F1/F4 3d Printer board. Worth a kickstarter?

i think the board alone would see quite a bit of price competition, as chinese 3d printer kits sells for under usd $200 these days for a complete kit. there have been some success stories (not necessarily via kickstarter), like the replicape that pairs up with a beagle bone black https://www.thing-p...
by ag123
Thu Feb 08, 2018 5:27 am
Forum: General discussion
Topic: Proposal. Use forum logins on the wiki
Replies: 12
Views: 243

Re: Proposal. Use forum logins on the wiki

i'm rather surprised that spambots these days are so intrusive, i''ve not been aware of these as i'm not running a forum or such web myself. but i did note that some spambots search forums etc for email addresses e.g. looking for the @ symbol and i did get spam coming to my email , i've been careful...
by ag123
Wed Feb 07, 2018 5:35 am
Forum: General discussion
Topic: Serial Port for USB on the MAPLE-Mini ?
Replies: 10
Views: 246

Re: Serial Port for USB on the MAPLE-Mini ?

i've got this sketch for a simple minded usb-serial dongle,
viewtopic.php?f=18&t=2752
i don't really implement the RS232 signals, rather i simply hard coded the interface at the uart end of it
on the usb side, the signals actually won't matter
by ag123
Wed Feb 07, 2018 5:28 am
Forum: General discussion
Topic: Qemu or other emulators
Replies: 2
Views: 114

Re: Qemu or other emulators

actually i used this, that has qemu as part of it https://gnu-mcu-eclipse.github.io/ nevertheless qemu can't simulate everything or more correctly there's lots more development needed to emulate a stm32 m3 but it works for really basic scenarios like blinking a led, beyond that u may need to develop...
by ag123
Mon Feb 05, 2018 3:27 pm
Forum: Projects
Topic: BluepillF4 PCBs
Replies: 37
Views: 719

Re: BluepillF4 PCBs

i almost have an impulse to join a group purchase, e.g. the boards on the record i've 2 castellated nrf51822 boards https://www.ebay.com/itm/NRF51822-YJ-14015-Board-BLE4-0Bluetooth-2-4GHz-Core51822-B-Wireless-Module/172396174917 after receiving them i'm dumbfolded as i'm not sure how i'm going to so...
by ag123
Mon Jan 29, 2018 5:07 am
Forum: Off topic
Topic: Sucess on an old TFT display
Replies: 6
Views: 201

Re: Sucess on an old TFT display

i think there is a similar problem with 9 bit I2C on those ov7670 camera stuff, i'm not sure if the hardware spi/i2c is after all able to support 9 bit frames a google search turn up some ancient threads http://forums.leaflabs.com/forums.leaflabs.com/topic0445.html?id=243 https://electronics.stackex...