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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.
2y
@docbrown How would I connect a CMOS imager to the STM32H7XI
2y
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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.
2y
@docbrown How would I connect IC1 to U2?
2y
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@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.
2y
@docbrown what is R1 value if I want to divide 6V to 3.3V
2y
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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.
2y
@docbrown R4 is 10kOhm
2y
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!
2y
@docbrown If C3 is part of a low pass filter, what value should it be to provide a cutoff frequency of 500kHz?
2y
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Electrical Rule Checks
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Reports components with identical designators.
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Missing Power
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Single Pin Nets • 6
Net | Pin | ||
|---|---|---|---|
U2:P52 | |||
U2:P64 | |||
U2:P16 | |||
R3:P2 | |||
C1:P1 | |||
C2:P1 |
Reports nets that have only one pin connected.
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Overlapping Copper • 3
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Airwires • 11
Designators | Net | ||
|---|---|---|---|
Reports missing routed traces between pads in a net.
Layers with Multiple Fills
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Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.
Missing Footprints • 1
Designator | ||
|---|---|---|
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|---|---|---|---|
None | |||
None |
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Passive Components
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Learn moreCapacitor Voltage Rating
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- 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 for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #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 10,000uF 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 20pF 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 for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #genericsjharwinbarrozo15.3k
- 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
Inspect
Environmental Radiation Logger
Controls
Properties
Availability & Pricing
| Distributor | Qty 1 | |
|---|---|---|
| Digi-Key | $23.86–$24.00 | |
| LCSC | $9.15 | |
| Mouser | $23.98 | |
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