In Lapis website, they have graph including UV-index.
1V = 0 UV-Index
3V = 15 UV-Index
Don't know how they have calculated that, but lets take it as it is.
Scaling ADRaw: 310 (1V) - 925 (3V)...
Type: Posts; User: Gusse; Keyword(s):
In Lapis website, they have graph including UV-index.
1V = 0 UV-Index
3V = 15 UV-Index
Don't know how they have calculated that, but lets take it as it is.
Scaling ADRaw: 310 (1V) - 925 (3V)...
It seems that it is challenging to calculate accurate UV-Index (0-11+), as you would like to do.
Index is weighted using 3 different wavelengths and this broadband UV sensor covers all of them....
UV Index is defined W/m2 --> 1 mW/cm2 = 10 W/m2 (10x)
From datasheet:
UV Index: 0 = 1.0V (typ), 100 = 2.2V (typ)
Make sure that supply voltage is very stable, 1mV = 0.833 UV index
Check...
Driver can be programmed to keep outputs low as far as you command otherwise.
Try without any external resistors: serial resistor -> jumper, remove shunt (GND) resistor.
Add components only if...
You are right, 10mA pre-driver is weak even for this purpose, but still usable. Any application using higher switching frequency would compromise efficiency.
Scampy, charge calculation for future...
Hi Scampy,
Based on IRF3708 datasheet, Rdson = 9.5mOhm (typ), Vgs= 4.5V, Id= 12A, therefore PCA9865 should be OK to drive FET without pre-driver stage. Gate resistor might need fine tuning. Ten(s)...
There are couple of parameters that you should look.
1) Rdcon. This parameter tells how much energy will be burned in device while FET is conducting current. Low is better and range of 10-20mOhm...
I made a flasher/eraser program for I2C EEPROM (up to 24C64) thru PIC (e.g. PIC18F4520, 32K). So far, I have always had a socket (DIL8) for external EEPROM on PWB so that I can remove EEPROM for...
Thanks for the schematic update. Now I have to start gathering all needed components.
Why you have selected BS250, which has quite huge Rds(on), it is round 10 Ohm or more @3.3V. Why not go with a...
Very nice work Richard!
ILI9341 based TFT display with resistive touch screen could be the module that I was searching.
With STMPE610 touch controller (SPI/I2C) it would be easy to make systems...
Have you checked LCD Wiki pages?
There are most of the stuff you need available. Only thing you need to do is modify LCD controller specific parts to match your LCD display (e.g LCD init, std...
Try to change all ports to inputs before entering sleep.
With 18F4520 I can see big difference if I don't do that (~2mA vs 200uA, incl. quiescent current of the regulator).
After sleep change ports...
Hi Norm,
Thanks for the new version of FineLineIDE. I was trying it when I noticed something strange. Only part of code was visible in FineLineIDE and after debugging reason was Scandinavian...
Hi Fratello,
1) Do you have two PCB with different resistor values?
or
2) Have you changed resistors to same board and tested with two SW settings?
In case
1) there must be some other...
I think that you will not be able to do phase shift (delay) between 2 PWM outputs in same PIC. With 2 PIC's this might bee possible.
If your system is so time critical that GOTO-command will...
Would it be easier to do this with PWM module? With 32MHz you can reach 4MHz output frequency and accurate duty cycle.
I think these PIC's have just one PWM module. If that is not enough, then...
How about if you toggle pin in loop?
HEAD:
TOGGLE PORTA.2
GOTO HEAD
Use Google search and there you have it.
Lumia 520 schematics
Display is using MIPI DSI interface, so PIC's are not suitable for driving the display alone.
In addition, you will need a SW user...
Couple of years ago I had a similar problem/question.
See this post. It might help you.
Take a look to Voltage Divider Example.
There is everything you need.
10k and 3k3 doesn't give you 1:3 divider. Resistor ratio in your case should be 1:2 (e.g 11k and 22k).
Link above explain...
What kind of voltage divider you are using?
If you try to get full 0-5V scale with 0-15V input, then you should use 1:3 ratio (e.g. 22kOhm and 11kOhm resistors) to get best measurement accuracy.
...
Sounds that you may have other problems than signal line and components between two PICs.
- Power supply and de-couplings (internal noise)?
- External noise coupling (shielding to transmission path...
Thanks Henrik!
It seems that GUI MPLAB's needed additional setting to power the target.
Power -> Power Target Circuit from Tool (ICSP Options)
Now it work like a charm.
I was already thinking the next generation version with both way communication (a step ahead) ;)
2 diodes in series is a good solution!
See old Philips I2C application note AN97055, page 10 (Devices with different logic levels connected via the bi-directional level shifter).
In addition what they propose, you can use e.g BS170,...