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@docbrown How would I connect a CMOS imager to the STM32H7XI
Great Scott! To connect a CMOS imager to the STM32H7XI, you need to use the parallel camera interface supported by the STM32H7 series called DCMI (Digital Camera Interface). This interface allows you to connect CMOS image sensors up to a resolution of 16 Mpix. Here's an outline of the procedure:
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First, find a suitable CMOS image sensor based on your requirements (e.g., resolution, frame rate, size). Popular choices include the OV7670, OV2640, or OV5640.
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Consult the datasheets of both the STM32H7XI and the chosen CMOS imager to identify the necessary pins for communication. You'll need to match up the DCMI bus pins (D0-D7 for an 8-bit interface), VSYNC, HSYNC, PIXCLK, and associated power and ground pins. Optionally, you can connect I2C pins for camera configuration and a reset signal to manage the sensor's operation.
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Create the circuit schematic by connecting the identified pins between the STM32H7XI and the CMOS imager. Be sure to provide appropriate decoupling capacitors and proper power supply filters.
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Configure the DCMI peripheral on the STM32H7XI using the STM32CubeMX tool and the HAL (Hardware Abstraction Layer) libraries to capture images or video frames from the CMOS imager. You will also need to configure the I2C peripheral to communicate with the image sensor for initialization and control.
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Implement firmware that initializes the I2C peripheral on the STM32H7XI and sets up the CMOS imager with the desired settings (e.g., resolution, format, frame rate).
Please note that the specific steps and camera settings may vary depending on the CMOS imager you choose. So it's crucial to carefully review the datasheets and available software libraries for generating the necessary configuration.
3y
@docbrown How would I connect a CMOS imager to the STM32H7XI
3y
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@docbrown How would I connect IC1 to U2?
To connect IC1 (DS3231M+ Real-Time Clock) to U2 (STM32F405RGT6 microcontroller), you need to connect the I2C data line (SDA) and the I2C clock line (SCL). Here's the connection scheme:
- Connect the SDA pin (pin 15) of IC1 to the I2C SDA pin on the microcontroller U2. For the STM32F405RGT6, you have multiple I2C interfaces to choose from. For example, you can use I2C1_SDA (PB7, pin 27) or I2C2_SDA (PB11, pin 51).
- Connect the SCL pin (pin 16) of IC1 to the I2C SCL pin on the microcontroller U2. Similar to the SDA pin, you have multiple options, such as I2C1_SCL (PB6, pin 26) or I2C2_SCL (PB10, pin 50).
Additionally, if you'd like to use the interrupt or square wave functionalities of IC1, you can connect the INT/SQW pin (pin 3) to an appropriate GPIO pin on the STM32F405RGT6 that supports external interrupts. Remember to use appropriate pull-up resistors for the SDA and SCL lines and decoupling capacitors for power supply pins.
3y
@docbrown How would I connect IC1 to U2?
3y
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3
@docbrown what is R1 value if I want to divide 6V to 3.3V
To create a voltage divider that drops 6V to 3.3V, you can use two resistors, R1 and R2, in series. In this case, we'll call R1 the resistor connected to 6V and R2 the resistor connected to GND (position 1069, 44). The output voltage (Vout) is taken across R2.
Using the voltage divider equation, Vout = Vin * (R2 / (R1 + R2)),
where Vin = 6V and Vout = 3.3V.
Let's select R2 as a known value, say, 10 kΩ. To find R1, you can rearrange the equation as:
R1 = R2 * ((Vin / Vout) - 1)
Plugging the values into the equation:
R1 = 10 kΩ * ((6V / 3.3V) - 1)
R1 ≈ 8.18 kΩ
So, you can pick R1 to be around 8.2 kΩ (a standard value) with R2 at 10 kΩ to achieve a 3.3V output from a 6V input using a voltage divider. Keep in mind that this simple voltage divider is not an ideal solution for a consistent and reliable 3.3V supply because any change in input voltage or load will affect the output voltage as well. Consider using a voltage regulator if you need a stable voltage supply.
3y
@docbrown what is R1 value if I want to divide 6V to 3.3V
3y
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@docbrown If C3 is part of a low pass filter, what value should it be to provide...
Great, now that we know R4 is 10kOhm, we can calculate the value of C3 for a 500kHz cutoff frequency using the formula:
C = 1 / (2 * PI * R * cutoff_frequency)
C = 1 / (2 * PI * 10,000 * 500,000)
C ≈ 3.18e-12 F
So, the value of C3 should be approximately 3.18 pF to achieve a cutoff frequency of 500 kHz in the low-pass filter configuration.
3y
@docbrown R4 is 10kOhm
3y
To determine the value of C3 for a 500kHz cutoff frequency, we also need to know the value of the resistor connected to C3 in the low-pass filter configuration. Based on the provided netlist, it looks like R4 is connected with C3.
From the netlist:
Net 0 connects +6V_V_MON:P1, , +6V_V_MON:P1, C3:P2, R4:P1, U2:P62
Net 9 connects R2:P2, R1:P1, R4:P2
Assuming C3 and R4 form a first-order low-pass filter, we can use the formula to calculate the capacitor value:
cutoff_frequency = 1 / (2 * PI * R * C)
Where R is the resistor value and C is the capacitor value. Rearranging for C, we get:
C = 1 / (2 * PI * R * cutoff_frequency)
For a 500kHz cutoff frequency, please provide the value of R4, and I can help you calculate the value for C3!
3y
@docbrown If C3 is part of a low pass filter, what value should it be to provide a cutoff frequency of 500kHz?
3y
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Reviews
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #powerjharwinbarrozo11.4M
- A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibraryjharwinbarrozo15.8k
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlinkjharwinbarrozo1.2M
- 10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcanjharwinbarrozo1.2M
- Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlinkjharwinbarrozo1.1M
Project Outline:
Microcontroller
RTC
Dosimeter Op Amp Stage
Properties
Properties describe core aspects of the project.
Pricing & Availability
Distributor | Qty 1 |
|---|---|
Digi-Key | $23.86–$24.00 |
LCSC | $9.15 |
Mouser | $23.98 |
Controls
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