On Monday, March 18, 2019 at 2:28:50 PM UTC-4, utkud...@gmail.com wrote:
> Hi, I need to make a circuit which does the following thing:
>=20
> When it sees a red object it will send output 0 until it sees a green obj=
ect (like a well colored cubic toy), after it sees green it will send outpu=
t 1 until it sees red again. ( If it is hard to implement I'm ok with just =
output 0 when it sees red and outputs 1 when it sees green, I mean it is ok=
if the outputs not continuous but it would be great if they are continuous=
)=20
>=20
> I have basys3 and have to use VHDL. I think I should use TCS34725 sensor =
https://www.adafruit.com/product/1334 but I'm not sure I just assumed, I wo=
uld be really glad if someone helps
>=20
> Some extra questions: If it is possible I will implement it on a toy RCca=
r is it possible to connect it with Bluetooth module to get inputs or how s=
hould I do it ?- I can use another board JUST FOR CONNECTIONS my main Proje=
ct should be on BASYS-3
>=20
> Thanks
Are you familiar with finite state machines (FSM)? I think FSM will be the=
best circuit for this task since you want it to remember which color it la=
st saw. =20
The inputs to the FSM will need to come from a much more complex circuit th=
at reads the state of the color sensor via I2C and makes a decision as to t=
he color it is seeing. This will need to pick three states of the input co=
lor, red, green and neither. =20
To get the color data to make these decisions will require a controller cir=
cuit to read the registers in the chip. Looking at the data sheet it looks=
like this is not completely straight forward but requires a sequence of op=
erations to make the chip sample the light through ADCs. So you should mak=
e sure you understand this process. You may want to read the library code =
to see the sequence of operations implemented there while correlating that =
with the data sheet. =20
So read the data sheet, look at the code and make sure you understand what =
is required to get the data out of the color sensor. Once you design that =
circuit you can try testing it by just driving I/O lines with the data valu=
es and looking at them on the oscilloscope. If you pump the samples out se=
rially, you can see it on the oscilloscope with the low order bits toggling=
furiously but the higher order bits fairly stable but changing as you chan=
ge colors. =20
When you think you are reading the color chip correctly, add the circuit to=
weight the values and produce the two signals "red" and "green". See if y=
ou can get these to work. =20
I would say you should construct a test bench and simulate it, but explaini=
ng to you how to construct a model of the color chip might be more than you=
can do. If you think you can do that, the test bench would be much better=
than working on the actually FPGA because you can "see" any signal in the =
design.=20
Rick C.
Reply by ●March 18, 20192019-03-18
Hi, I need to make a circuit which does the following thing:
When it sees a red object it will send output 0 until it sees a green objec=
t (like a well colored cubic toy), after it sees green it will send output =
1 until it sees red again. ( If it is hard to implement I'm ok with just ou=
tput 0 when it sees red and outputs 1 when it sees green, I mean it is ok i=
f the outputs not continuous but it would be great if they are continuous)=
=20
I have basys3 and have to use VHDL. I think I should use TCS34725 sensor ht=
tps://www.adafruit.com/product/1334 but I'm not sure I just assumed, I woul=
d be really glad if someone helps
Some extra questions: If it is possible I will implement it on a toy RCcar =
is it possible to connect it with Bluetooth module to get inputs or how sho=
uld I do it ?- I can use another board JUST FOR CONNECTIONS my main Project=
should be on BASYS-3
Thanks
=20