Oxímetro Sin Microcontrolador

flux

0:43

A continuación se muestra un resumen de la arquitectura conceptual para un oxímetro reflectivo sin microcontrolador, con salida mediante display de 3 dígitos de 7 segmentos y alimentado a 5V:

Table

BloqueFunción y componentes sugeridosNotas/Componentes Referenciables
Sensor Reflectivo- Emisor LED: Emite luz (por ejemplo, LED infrarrojo o de color rojo según la selección de diseño).- Receptor: Fototransistor o fotodiodo que capta la luz reflejada.Puedes buscar LED Infrarrojo y Fototransistor.
Acondicionamiento de Señal- Amplificación con op-amps (ej. LM358) para amplificar la débil señal del fotodetector.- Filtros analógicos para separar la señal pulsátil.Es importante ajustar ganancia y filtrado para eliminar ruido.
Conversión de Pulsos- Convertir la señal pulsátil en un formato analógico proporcional (por ejemplo, usando un convertidor frecuencia-tensión como el LM2917).Esto permitirá generar una tensión que represente la frecuencia cardíaca o el pulso.
Circuito Digital de Visualización- Contador o conversor analógico a BCD que transforme la señal acondicionada en dígitos para el display.- Decodificadores BCD a 7 segmentos (por ejemplo, CD4511) para manejar cada dígito del display.Se requiere además un multiplexor o lógica adicional para actualizar el display de 3 dígitos.
Fuente de Alimentación- Regulación y distribución de una alimentación estable de 5V para todos los bloques.Se puede utilizar un regulador como el 7805 si se parte de una tensión mayor.
Esta propuesta es solo un ejemplo de cómo se pueden estructurar los bloques sin utilizar un microcontrolador. Cada bloque se debe diseñar cuidadosamente:
  • El bloque de sensor debe garantizar un buen acoplamiento óptico.
  • El bloque de acondicionamiento (amplificación y filtrado) requerirá ajuste de componentes pasivos (resistencias y condensadores) para optimizar la respuesta.
  • La conversión de la señal (frecuencia a tensión) y su posterior conteo/decodificación para el display demandarán circuitos analógicos y digitales discretos.
¿Te gustaría que elaboremos una sugerencia de esquema conectando estos bloques o prefieres identificar primero algunos componentes específicos para cada bloque?
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  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
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  • Generic Resistor
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  • Generic Capacitor
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    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 #CommonPartsLibrary
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  • Generic Inductor
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  • Terminal
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  • 875105359001
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  • CTL1206FYW1T
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Frightened Coffee T-800

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