Search found 6426 matches

by RogerClark
Thu Aug 24, 2017 10:34 am
Forum: General discussion
Topic: Rebooting to DFU bootloader in F4 and others.
Replies: 13
Views: 130

Re: Rebooting to DFU bootloader in F4 and others.

Thanks devan

Its interesting that LibOpenCM3 creates a larger binary than the Maple bootloader.

The backup registers code is not essential, so that would make some space.

Thanks

Roger
by RogerClark
Thu Aug 24, 2017 10:32 am
Forum: Projects
Topic: HB100 Radar speed detector
Replies: 8
Views: 80

Re: HB100 Radar speed detector

Thanks Pito

My local electronics shop should have the LM324 in stock, so I will drive there at the weekend and buy one (albeit at an inflated price of $2.50 !)

I'll also take a look in my box of IC's but I think its mainly old 74xx series
by RogerClark
Thu Aug 24, 2017 8:01 am
Forum: Projects
Topic: HB100 Radar speed detector
Replies: 8
Views: 80

Re: HB100 Radar speed detector

umm I just looked at the sound detector modules that I have and they are different :-( They use a LM393. I'll need to see if I can find a schematic for that type, so see if its practical to modify them Edit. I just looked at the datasheet and the LM393 is a comparitor not an opamp. PS. I did try usi...
by RogerClark
Thu Aug 24, 2017 7:47 am
Forum: Projects
Topic: HB100 Radar speed detector
Replies: 8
Views: 80

Re: HB100 Radar speed detector

@pito

Yes. I know I need to change the feedback resistor.

I think in that post, the author change the 100k to 1M, so increased the gain by 10 x

I could remove it completely, but I think it would end up being worse as I already have problems with noise
by RogerClark
Thu Aug 24, 2017 7:43 am
Forum: Libraries & Hardware
Topic: How to use USART1_IRQhandler with stm32f103
Replies: 6
Views: 44

Re: How to use USART1_IRQhandler with stm32f103

Which repo did you download from. There are 3 completely different github accounts / repo's that you could be using

However my guess is you are using Arduino_STM32 from my github account www.github.com/rogerclarkmelbourne ???
by RogerClark
Thu Aug 24, 2017 7:41 am
Forum: General discussion
Topic: Rebooting to DFU bootloader in F4 and others.
Replies: 13
Views: 130

Re: Rebooting to DFU bootloader in F4 and others.

Hi Devan Thanks. I thought I recognised the author's name ;-) I thought I could modify your code to behave in a similar way to the Maple bootloader BTW. The LibMaple core currently does not set the Backup registers so the PC has to be ready quickly as the bootloader only stays in DFU for about 1 sec...
by RogerClark
Thu Aug 24, 2017 7:36 am
Forum: Projects
Topic: HB100 Radar speed detector
Replies: 8
Views: 80

Re: HB100 Radar speed detector

@pito Thanks I don't have any descrete opamps , but I found this http://www.instructables.com/id/Radar-With-Arduino-HB100-and-MAX446/ which shows how to convert a MAX446 based microphone sound detector as the amplifier Its probably not as good as the 2 opamp circuit, but I will try it, as it will be...
by RogerClark
Thu Aug 24, 2017 2:55 am
Forum: General discussion
Topic: Rebooting to DFU bootloader in F4 and others.
Replies: 13
Views: 130

Re: Rebooting to DFU bootloader in F4 and others.

I cant find any STM code for a bootloader, but I have found a bootloader written using LibOpenCM3 for the F1 The repo says the F1 build is compatible with my F1 repo, which is interesting https://github.com/devanlai/dapboot It is probably worth trying that and if its any good, then see if it can be ...
by RogerClark
Wed Aug 23, 2017 11:27 pm
Forum: Projects
Topic: Motion and speed detector
Replies: 31
Views: 843

Re: Motion and speed detector

I've started a new thread about the HB100,

http://www.stm32duino.com/viewtopic.php?f=19&t=2496

As this thread is mainly about the other (completely different) motion detector, where as the HB100 is a more conventional doppler radar module
by RogerClark
Wed Aug 23, 2017 11:26 pm
Forum: Projects
Topic: HB100 Radar speed detector
Replies: 8
Views: 80

HB100 Radar speed detector

I had time last night to power up one of those HB100 Doppler radar modules. You just need to supply 5V, and it outputs the "IF" signal, which is be mix product from the transmitter and the incoming received signal. This is the sum and the difference of the Tx and Rx, but the only usable signal is of...